How many moles of o are in 15.0 mol fe(no3)3?

Answers

Answer 1
n[Fe(NO₃)₃]=15.0 mol

n(O)=3×3×n[Fe(NO₃)₃]=9n[Fe(NO₃)₃]

n(O)=9×15.0=135.0 mol
Answer 2

Answer : The number of moles of oxygen atoms are 135 moles.

Explanation : Given,

Moles of [tex]Fe(NO_3)_3[/tex] = 15.0 mole

The given chemical formula is, [tex]Fe(NO_3)_3[/tex]

By the mole concept:

In [tex]Fe(NO_3)_3[/tex], there are 1 mole of iron (Fe) atom, 3 moles of nitrogen (N) atoms and 9 moles of oxygen (O) atoms.

As, 1 mole of [tex]Fe(NO_3)_3[/tex] contains 9 moles of oxygen atoms

So, 15.0 moles of [tex]Fe(NO_3)_3[/tex] contains [tex]15.0\times 9=135[/tex] moles of oxygen atoms.

Hence, the number of moles of oxygen atoms are 135 moles.


Related Questions

How many protons are there in 20.02 mol of neon (ne)?

Answers

Answer: There are 1.216×10^26 protons in 20.02mole of neon

Explanation:

Using Avogadro's number

1 mole of neon contains 6.023×10^23 neon atoms.

I atm contains 10 protons

Number of protons = (6.023×10^23)×20.02×10= 1.216×10^26

One important difference between covalent and ionic bonds is that:select one:a. in covalent bonds two atoms share electrons while in ionic bonds two atoms of opposite charge are attracted to each other.b. ionic bonds only occur among water-soluble elements.c. in ionic bonds two atoms share electrons, while in covalent bonds one atom gives one or more electrons to the other atom.d. in ionic bonds both protons and electrons can be shared while in covalent bonds only electrons can be shared.e. ionic bonds are much stronger than covalent bonds.

Answers

A. in covalent bonds two atoms share electrons while in ionic bonds two atoms of opposite charge are attracted to each other

The correct answer is 'a'. In covalent bonds, two atoms share electrons, while in ionic bonds, two atoms of opposite charge are attracted to each other.

In a covalent bond, two atoms share electrons to achieve a stable electron configuration. This sharing of electrons allows both atoms to fill their outermost energy levels and become more stable. An example of a covalent bond is the bond between two hydrogen atoms in a hydrogen molecule . In this case, both hydrogen atoms share their single electron to form a stable molecule.

On the other hand, in an ionic bond, two atoms of opposite charge are attracted to each other due to the transfer of electrons. One atom loses electrons to become positively charged (cation), while the other atom gains electrons to become negatively charged (anion). These oppositely charged ions are then attracted to each other, forming an ionic bond.Thus, the correct option is 'A'.

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The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function p = 120i i2 + i + 9 where i is the light intensity (measured in thousands of foot-candles). for what light intensity is p a maximum?

Answers

The given function is:

P = 120 i / (i^2 + i + 9)

or

P = 120 i (i^2 + i + 9)^-1

The maxima point is obtained by taking the 1st derivative of the function then equating dP / di = 0:

dP / di = 120 (i^2 + i + 9)^-1 + (-1) 120 i (i^2 + i + 9)^-2 (2i + 1)

setting dP / di =0 and multiplying whole equation by (i^2 + i + 9)^2:

0 = 120 (i^2 + i + 9) – 120i (2i + 1)

Dividing further by 120 will yield:

i^2 + i + 9 – 2i^2 – i = 0

-i^2 + 9 =0

i^2 = 9

i = 3      (ANSWER)

Therefore P is a maximum when i = 3

Checking:

P = 120 * 3 / (3^2 + 3 + 9)

P = 17.14

Final answer:

To find the light intensity at which photosynthesis rate for a given phytoplankton species is maximal, you must differentiate the function expressing photosynthesis rate in terms of light intensity, set the derivative equal to zero, and solve for i. This equation's solutions are the critical points where the rate of photosynthesis may reach a maximum.

Explanation:

The question asks when photosynthesis rate (in mg carbon/m3/h) for a certain species of phytoplankton is maximal, given the function p = 120i / (i2 + i + 9) where i stands for light intensity (in 1000s of foot-candles).

To find the maximum value for any given function, you must find the derivative of that function (also referred to as the rate of change) and set it to equal zero. This can be performed using calculus, specifically the application of differentiation rules. Since the given function is a complex fraction, it's necessary to apply the Quotient Rule of differentiation, which states that the derivative of the quotient of two functions is the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator all over the square of the denominator.

Once you have found the derivative, you find its roots by solving for i when the derivative equals zero. These i values provide the inflection points of the initial function which correspond to either the maximum or minimum values of p (these can be distinguished by checking a value to the left and right of each root), or where the function has a horizontal tangent.

In this way, the intensity of light at which photosynthesis rate for the phytoplankton is maximal can be derived.

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Rate is related to?
A. Volume
B. Time
C. Distance
D. Percentage


Answers

I would say B. Time 
hope this helps:)

Ans: B) Time

Rate is a measure of change of a particular property over a certain time period. The property could be concentration, volume, mass etc.

Mathematically, if x denotes a certain property and t denotes the time then:

Rate = Δx/Δt = x2-x1/t2-t1

x1 and x2 are the initial and final values of the measured property measured at time t1 and t2 respectively.

Thus, rate is related to time.

Write the balanced molecular equation for the neutralization reaction between hi and ba(oh)2 in aqueous solution. include physical states.

Answers

So, Ba is divalent. This means that each Ba(OH)2 requires two I in order to produce one BaI2 molecule.
The two hydrogens from the 2 HI molecules will combine with 2 OH of Ba(OH)2 forming 2 water (H2O) molecules.

The equation which illustrates this reaction in as follows:
2 HI (aq) + Ba(OH)2 (s) ........> BaI2 (aq) + 2 H2O (l)
where:
aq refers to aqueous state
s refers to solid state and
l refers to liquid state.

2HI(aq)+Ba(OH)2(aq) ----> 2H2O(l) + BaI2(aq)

Nickel and gold combine to make white gold. White gold is considered a(n) of nickel and gold.

Answers

i think metal combinations are called alloy
White gold is considered an alloy of nickel and gold.
Alloy is the term which refers to the combination of metals, in which a new type of a metal is created. When you mix gold and some other white metal (such as nickel, palladium, or manganese), you get an alloy known as white gold. 

Dinitrogen tetroxide decomposes to produce nitrogen dioxide gas. When dinitrogen tetroxide is sealed in an evacuated glass container, the closed system eventually reaches dynamic equilibrium. Which statement describes the graph of the rate of the forward reaction over time? It starts high and gradually decreases until it levels out above zero. It starts high and gradually decreases until it reaches a rate of zero. It starts low and gradually increases until it levels out at a rate above zero. It starts low and gradually increases until it reaches a maximum rate.

Answers

Final answer:

The rate of the forward reaction where dinitrogen tetroxide decomposes to nitrogen dioxide starts high and gradually decreases until it levels out above zero, due to reaching a state of dynamic equilibrium.

Explanation:

In the reaction where dinitrogen tetroxide decomposes to produce nitrogen dioxide, the graph of the rate of the forward reaction over time would start high and gradually decrease until it levels out above zero. This is because when the reaction begins, the concentration of reactant (dinitrogen tetroxide in this case) is at its maximum, thus the rate of the forward reaction is high. However, as the reaction progresses and more product (nitrogen dioxide) is generated, the concentration of dinitrogen tetroxide decreases and thus the rate of the forward reaction also decreases. This continues until a dynamic equilibrium is reached where the rate of the forward reaction equals the rate of the reverse reaction and the concentrations of reactant and product are constant.

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The rate of the forward reaction in the decomposition of N₂O₄ to NO₂ starts at zero, increases as the reaction proceeds, and levels out above zero once dynamic equilibrium is reached, where it becomes equal to the reverse reaction rate.

When dinitrogen tetroxide (N₂O₄) decomposes to produce nitrogen dioxide (NO₂), we observe the concept of chemical equilibrium in a closed system. Initially, the rate of the forward reaction, which is the decomposition of N₂O₄ to 2NO₂, starts at zero because there is no NO₂ to decompose. As the decomposition proceeds, this rate increases as more N₂O₄ is converted to NO₂. Over time, the forward reaction rate gradually increases and then levels out above zero when dynamic equilibrium is reached. At equilibrium, the rate of the forward reaction becomes equal to the rate of the reverse reaction, which is the dimerization of NO₂ to reform N₂O₄.

The diatomic molecule h2 has an extremely low boiling point because

Answers

The diatomic molecule H2 has an extremely low boiling point because only weak Vander waals forces are present between the atoms of hydrogen molecule. This weak inter-molecular forces are easily broken when heat is apply resulting in low boiling point.

Which solution below has the highest concentration of hydroxide ions?
a.ph = 3.21
b.ph = 12.6
c.ph = 7.93
d.ph = 9.82
e.ph = 7.00?

Answers

B. It has the highest pH so it is the most basic, thus containing the highest concentration of hydroxide ions.

Explain the importance of carbohydrates and lipids in the human body. Include a discussion of at least two functions of carbohydrates and the roles of two groups of lipids.

Answers

Carbohydrates are a group of molecules made out of carbon,hydrogen and oxygen. There are different types of carbs, such as the monosaccharides, the disaccharides and the polysaccharides. The most important metabolic substrate is glucose which is a monosaccharide and it is needed for respiration to produce energy. Lactose is a disaccharide, made of galactose and glucose and it is the carbohydrate for young mammals.Glycogen is a polysaccharide which is made of many glucose molecules, and it is an energy store.
Lipids are anither group of molecules which is made of the same elements as the carbohydrates but at differeent proportions.In the human body there are different types of lipids which have numerous functions like insulation, energy storing, production of certain hormones etc.Cholesterol is a lipid molecule which is responsible for maintaing the fluidity of the cell membrane. A phospholipid is a component of the cell membrane as it makes up the bilayer.

Did your response contain the following points? You may have discussed additional points that are not listed here.  

Both carbohydrate and fat molecules release energy when cells break them down.

Many carbohydrates contain fiber, which the body cannot break down but which can help the digestive system function.

Sterols are important lipids that cells can convert into compounds the body needs, such as vitamins, some hormones, and bile salts.

Phospholipids are important structural components of cells.

how many electrons would be represented in the lewis dot notation for an atom of oxygen?A,2.B.6.C.8.D.18

Answers

The answer is b since oxygen has 6 valence electrons.

A 13.00 g sample of a compound contains 4.15 g potassium (k), 3.76 g chlorine (cl), and oxygen (o). calculate the empirical formula.

Answers

To solve this problem, let us all convert the mass of each element into number of moles using the formula:

moles = mass / molar mass

Where,

molar mass K = 39.10 g / mol

molar mass Cl = 35.45 g / mol

molar mass O = 16 g / mol

and mass O = 13 g – 4.15 g – 3.76 g  = 5.09 g

 

moles K = 4.15 g / (39.10 g / mol) = 0.106 mol

moles Cl = 3.76 g / (35.45 g / mol) = 0.106 mol

moles O = 5.09 g / (16 g / mol) = 0.318 mol

 

The ratio becomes:

0.106 K: 0.106 Cl: 0.318 O

We divide all numbers with the smallest number, in this case 0.106. This becomes:

K: Cl: 3O

 

Therefore the empirical formula is:

[tex] KClO_{3} [/tex]

The reaction of hemoglobin with oxygen can be written as follows. hb + o2 â hbo2 if the amount of oxygen available to the blood decreases significantly, what happens to the individual involved?

Answers

Oxygen is needed to carry out a lot of biochemical processes in the body. If the amount of oxygen available to the blood decreases significantly a lot of things will go wrong in the body. For instance, lack of adequate oxygen will lead to the death of neurons which will eventually leads to brain cells death and irreparable brain damage. Oxygen is also needed for cellular respiration, without respiration, there will not be oxygen for carrying out various cellular activities and this will result into death. Oxygen deprivation will also leads to difficulty in breathing and other associated problems.

Why does 50 g of water initially at 0 ∘c warm more quickly than 50 g of an ice/water mixture initially at 0 ∘c?

Answers

50 gram of water initially at 0°C, when we increase the temperature to warm the water, it will warm quickly but if 50 g of an ice/water mixture initially at 0°C warms slowly than simple water.
Because when we increase temperature, in simple water only water absorb that heat and warms quickly. But when we increase the temperature of mixture of ice/water, the temperature or heat is first absorbed by ice to melt and then it will warm, that's why it takes more time.

Is smelting a chemical or physical process?

Answers

Smelting is chemical because you are refining the ore. Also when you heat substances, there is a chance you will decompose some compounds in the process.

If 3.50 g of the unknown compound contained 0.117 mol of c and 0.233 mol of h, how many moles of oxygen, o, were in the sample?

Answers

To determine the amount of oxygen that is present in the compound, we have to assume that the given compound contains carbon, hydrogen and oxygen only or else we will not be able to determine the answer. We need to convert the moles of the elements given to units of grams by using the atomic mass of these elements. Then, from the total amount of the compound we subtract the masses of the elements. We do as follows:

                                                             mass
0.117 mol C ( 12.01 g / 1 mol ) =        1.41 g  
0.233 mol H ( 1.01 g / 1 mol )   =        0.24 g

Mass O = 3.50 g - 1.41 g - 0.24 g = 1.85 g O
Moles O = 1.85 g O ( 1 mol / 16 g ) = 0.116 moles O

Based on its location on the periodic table, which element would be most likely to form a negative ion?

A. Aluminum (Al)
B. Copper (Cu)
C. Sodium (Na)
D. Fluorine (F)

Answers

Fluorine ONLY form\s an ion with a -1 charge. The other three are metals, and metals for positively charged ions.

Answer: The element which is most likely to form negative ion is fluorine.

Explanation:

An ion is formed when a neutral atom looses or gains electrons.

When an atom looses electrons, it results in the formation of positive ion known as cation.When an atom gains electrons, it results in the formation of negative ion known as anion.

For the given options:

Option A: Aluminium

Aluminium is the 13th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^23p^1[/tex]

This element will loose 3 electrons to attain stable electronic configuration and will form [tex]Al^{3+}[/tex] ion

Option B: Copper

Copper is the 29th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^23p^64s^23d^9[/tex]

This element will loose 2 electrons to attain stable electronic configuration and will form [tex]Cu^{2+}[/tex] ion

Option C: Sodium

Sodium is the 11th element of the periodic table having electronic configuration of [tex]1s^22s^22p^63s^1[/tex]

This element will loose 1 electron to attain stable electronic configuration and will form [tex]Na^{+}[/tex] ion

Option D: Fluorine

Fluorine is the 9th element of the periodic table having electronic configuration of [tex]1s^22s^22p^5[/tex]

This element will gain 1 electron to attain stable electronic configuration and will form [tex]F^{-}[/tex] ion

Hence, the element which is most likely to form negative ion is fluorine.

A sample of gas has a pressure of 3.00 atm at 25 degrees Celsius. What would the pressure be at 52 degrees Celsius if the volume stays constant? Which gas law does this problem represent?

Answers

The law that relate pressure and temperature of gases at constant volumes is Gay-Lussac's Law.

It states that the pressure of a fixed mass of gas is directly proportional to the absolute temperature when the volume is constant.

 P / T = constant => P1 / T1 = P2 / T2

=> P2 = T2 * P1 / T1

Remember that the formula uses absolute temperatures.

T2 = 52 + 273.15 = 325.15 K

T1 = 25 + 273.15 = 298.15 K

=> P2 = 325.15K * 3.00 atm / 298.15K = 3.27 atm.

Answer: 3.27 atm

The formula of the compound formed in the reaction between aluminum and sulfur is

Answers

The formula is Al2S3

The fundamental mendelian process that involves the separation of contrasting genetic elements at the same locus would be called _______

Answers

The fundamental mendelian process that involves the separation of contrasting genetic elements at the same locus would be called segregation. It is called as Mendel's law of segregation which states that the allele pairs segregate during the process of gamete formation and they would unit during fertilization.

An ore contains fe3o4 and no other iron. the iron in a 36.6-gram sample of the ore is all converted by a series of chemical reactions to fe2o3. the mass of fe2o3 is measured to be 29 g. what was the mass of fe3o4 in the sample of ore?

Answers

To solve this problem, let us first find for the molar mass of Fe2O3 and Fe3O4.

Fe = 55.85 g/mol and O = 16 g/mol

Therefore,

Fe2O3 = 159.7 g/mol

Fe3O4 = 231.55 g/mol

 

We are given that there are 29 g of Fe2O3, we calculate for the amount of Fe from this in moles:

mol Fe = 29 g Fe2O3 (1 / 159.7 g/mol) (2 mol Fe / 1 mol Fe2O3)

mol Fe = 0.363 mol

 

Converting this to Fe3O4:

mass Fe3O4 = 0.363 mol Fe (1 mol Fe3O4 / 3 mol Fe) (231.55 g/mol)

mass Fe3O4 = 28.03 g


Therefore there are 28.03g of Fe3O4 in the ore.

Which element in period 4 has the highest electronegativity? potassium calcium copper bromine

Answers

The answer would be bromine because electronegativity increases as you move up and to the right on the periodic table, and if you keep moving right you will see that bromine has the highest electronegativity out of those four elements.

Answer: Bromine has the highest electronegativity in period 4 of the periodic table.

Explanation:

Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.

This property of an atom increases as we move from left to right in a period because the number of charge on the nucleus gets increased.

But this property decreases as we move from top to bottom in a group because electrons get add up in the new shells which make them further far away from the nucleus.

For the given options:

Potassium is present in Group 1, Period 4 of the periodic table.

Calcium is present in Group 2, Period 4 of the periodic table.

Copper is present in Group 11, Period 4 of the periodic table.

Bromine is present in Group 17, Period 4 of the periodic table.

Hence, bromine will have the highest electronegativity in Period 4.

Vapor-pressure lowering is a colligative property of a solution, which means that it depends only upon _____.

Answers

It depends only on the concentration of molecules in a solvent. A colligative property is one that depends only on the ratio of the number of molecules of solvent to the number of molecules of solute (i.e., the concentration). It is not affected by the size of the sample or the identity of the substance.

Answer:

the number of solute particles

Explanation:

just aced the exam

A compound analyzed as 18.0% carbon, 2.26% hydrogen, and 79.7% chlorine. calculate the empirical formula of the compound.

Answers

To answer this item, our basis is 100g. We solve for the masses of the given elements in this item,
 
            carbon:     (0.18)(100 g) = 18 g
            hydrogen:  (0.0226)(100 g) = 2.26 g
            chlorine:    (0.797)(100 g) = 17.7 g

Then, we calculate for the number of moles by dividing the masses by the molar masses of the given elements.

Number of moles:

              carbon = (18 g) x (1 mol / 12 g) = 1.5 moles
             hydrogen = (2.26 g) x (1 mol/ 1.01 g) = 2.23 moles
             chlorine = (79.7 g) x (1 mol / 35.45 g) = 2.25 moles

We get the ratio of the number of moles by dividing them with the lowest value, 1.5.
                      Carbon = 1.5 moles / 1.5 = 1
                      Hydrogen = 2.23 moles / 1.5 = 1.48
                      Chlorine = 2.25 / 1.5 = 1.5

The empirical formula is,
                     C1H1.5CL1.5
Simplifying,
                    C2H3Cl3

Final answer:

The empirical formula of a compound with 18.0% carbon, 2.26% hydrogen, and 79.7% chlorine can be calculated by converting the percentages to grams, assuming a 100 g sample, and then converting that to moles. The moles are then used to find the simplest whole number ratio, and after comparison and adjustment, we deduce an empirical formula of C₂H₃Cl₃.

Explanation:

To calculate the empirical formula of a compound with a given percent composition, we first convert the percentages to grams, assuming we have a 100 g sample. This means the compound contains 18.0 g of carbon (C), 2.26 g of hydrogen (H), and 79.7 g of chlorine (Cl). Next, we convert the mass of each element to moles by dividing by its atomic mass (C: approximately 12.01 g/mol, H: approximately 1.01 g/mol, Cl: approximately 35.45 g/mol).

Step-by-step:

Convert the mass of each element to moles:\nCarbon: 18.0 g ÷ 12.01 g/mol = 1.5 mol\nHydrogen: 2.26 g ÷ 1.01 g/mol = 2.24 mol\nChlorine: 79.7 g ÷ 35.45 g/mol = 2.25 molDetermine the simplest whole number ratio of the elements in moles. To do this, divide the number of moles of each element by the smallest number of moles from the three elements calculated:

As hydrogen and chlorine are in almost a 1:1 molar ratio and carbon seems to be in a 2:3 ratio with chlorine, the empirical formula appears to be C₂H₃Cl₃. It's important to note that slight variations in these calculations could change the final empirical formula. Thus, we must adjust our calculations accordingly to ensure the molar ratios reflect whole numbers. If necessary, we multiply each of the mole ratios by the smallest common factor to obtain whole numbers.

Devise a way to separate a mixture of sand, salt, and iron filings. Write the procedure using a step-by-step method and explain the reasoning behind each step. CAN SOMEONE PLEASE HELP ME??????!!!!!!!!!

Answers

1. Iron fillings are magnetic, so use a magnet to pull the iron fillings out of the mix.
2. Then you can put the salt and sand mixture into water, since salt is soluble, and the salt will dissolve, leaving you with sand.
Final answer:

Separate a mixture of sand, salt, and iron filings by first using a magnet to remove the iron filings. Then, add water to dissolve the salt, and decant the salty water, leaving the sand behind. Finally, allow the water to evaporate to retrieve the salt.

Explanation:

To separate a mixture of sand, salt, and iron filings, you would first use a magnet to remove the iron filings from the mixture. This is possible because iron is a magnetic material and will be attracted to the magnet, which allows it to be separated from the non-magnetic substances (sand and salt).

Run a magnet over the mixture. Hold the magnet close but not directly in the substance, to attract only the iron filings.Next, to separate the sand and salt, add water to the mixture. Salt is soluble in water, which means it will dissolve in the water, but the sand will not.Stir the mixture to allow the salt to dissolve completely. Allow it to sit for a period to let the sand settle at the bottom.Then, decant (pour off) the salty water into another container, being careful to leave the sand behind.Finally, to retrieve the salt from the water, you can simply allow the water to evaporate, leaving the salt behind.

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Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390% cu by mass. if a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?

Answers

molar mass of copper is 63.546

so malar mass of the laccase is

4* 63.546
-------------- = 651.754
0.39

Answer:

65,179.487 g/mol is the molar mass of fungal laccase.

Explanation:

Percentage of copper in Fungal laccase = 0.390

Molar mass of fungal laccase = M

Number of copper atom in 1 fungal laccase molecule = 4

Atomic mass of copper = 63.55 g/mol

Percentage of an element in a compound:

[tex]\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass of compound}}\times 100[/tex]

Percentage of copper:

[tex]\frac{4\times 63.55 g/mol}{M}\times 100=0.390\%[/tex]

[tex]M=\frac{4\times 63.55 g/mol}{0.390}\times 100[/tex]

M = 65,179.487 g/mol

65,179.487 g/mol is the molar mass of fungal laccase.

If the temperature of a reaction is increased, the reaction proceeds at a much quicker rate because the

Answers

Explanation:

When we increase temperature of a substance then bond between the atoms will start to break and the molecules will move apart from each other. As a result, there will be increase in number of collisions between the molecules. Thus, reaction will occur at a faster rate.

Also,   K.E = [tex]\frac{3}{2}kT[/tex]

where          k = boltzmann constant

                    T = temperature

Hence, kinetic energy is proportional to temperature. So, more is the temperature more will be the kinetic energy. Therefore, more will be the rate of reaction.

What is the difference between h+ concentration in an acidic solution such as lemon juice (ph 2) and a basic solution such as household bleach (ph 13)?

Answers

The pH of solution is calculated using the formula:

pH = - log [H]

where [H] is the concentration of H+ ion in molarity

 

H+ concentration when pH = 2:

2 = - log [H]

[H] = 0.01 M

 

H+ concentration when pH = 13:

13 = - log [H]

[H] = 1 x 10^-13 M

 

The difference is therefore:

0.01 M - 1 x 10^-13 M = 0.01 M

 

The concentration at pH=13 is so small that it can be considered negligible.

Answer:

The pH of solution is calculated using the formula:

pH = - log [H]

where [H] is the concentration of H+ ion in molarity

H+ concentration when pH = 2:

2 = - log [H]

[H] = 0.01 M

H+ concentration when pH = 13:

13 = - log [H]

[H] = 1 x 10^-13 M

The difference is therefore:

0.01 M - 1 x 10^-13 M = 0.01 M

The concentration at pH=13 is so small that it can be considered negligible.

Explanation:

fourth period metalliod a very semiconductor material

Answers

The metalloids, elementes with properties in between metals and no metals are: boron, B; silicon, Si; germanium, Ge; arsenic, As; antimonium, Sb; tellurium, Te; polonium, Po; and astatine, At.

Germaniun and arsenic belong the the fourth period.

Germanium is an important semiconductor, very used in transistors and integrated circuits, while arsenic has different uses (it is not a semiconductor).

Therefore, the answer is germanium.



When the following reaction is balanced the coefficient in front of carbon dioxide is: ____ C5H12 + ____ O2 → ____ CO2 + ____ H2O

Answers

The coefficient in front of CO2 in the reaction: C5H12 + 8O25CO2 + 6H2O is 5.

BALANCING A CHEMICAL EQUATION:

To balance a chemical reaction means to make sure that the number of atoms of each element on both sides of the equation is the same.

To balance a chemical reaction, we make use of coefficients, which are numbers placed in front of the element.

In the reaction given as follows: C5H12 + O2CO2 + H2O, the number of atoms of carbon, hydrogen, and oxygen are not equal on both sides of the equation.

The balanced chemical equation is as follows: C5H12 + 8O25CO2 + 6H2O. This shows that the coefficient in front of carbon dioxide is 5.

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Final answer:

The coefficient in front of carbon dioxide (CO2) when balancing the reaction C5H12 + O2 → CO2 + H2O is 5, as we need 5 CO2 molecules to match the 5 carbon atoms in C5H12.

Explanation:

To find the coefficient in front of carbon dioxide (CO2) when the given reaction C5H12 + O2 → CO2 + H2O is balanced, we first balance carbon (C) and hydrogen (H) atoms, since they appear in only one reactant and one product each. Then we adjust the oxygen (O) atoms. For the given reaction:

Balance carbon atoms: There are 5 carbon atoms in C5H12, so you need 5 carbon dioxide molecules to balance them. This gives us a coefficient of 5 for CO2.Balance hydrogen atoms: There are 12 hydrogen atoms in C5H12, so you need 6 water (H2O) molecules to balance them. This gives us a coefficient of 6 for H2O.Balance oxygen atoms: Now count the total oxygen atoms in the products: 5 CO2 molecules contribute 10 oxygen atoms, and 6 H2O molecules contribute another 6, for a total of 16 oxygen atoms. Since each O2 molecule has 2 oxygen atoms, we need 8 O2 molecules to get 16 oxygen atoms. This gives us a coefficient of 8 for O2.

The balanced chemical equation is:

1 C5H12 + 8 O2 → 5 CO2 + 6 H2O

Checking the balanced equation: There are 5 carbon atoms, 12 hydrogen atoms, and 16 oxygen atoms on both sides of the equation, thus confirming the reaction is balanced.

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