NEED HELP QUICKLY!!!!! Calculate the volume of each of the following gases at STP. Show your work.
A. 7.6 mol Ar
B. 0.44 mol C2H6
C. 3.6 mol NH3

Answers

Answer 1

Answer:

A. 170.24 dm³

B. 9.9 dm³

C. 80.6 dm³

Explanation:

Data Given:

no. of moles of Ar = 7.6 mol

no. of moles of C₂H₆ = 0.44 mol

no. of moles of NH₃ = 3.6 mol

Volume of each gas at STP = ?

Solution:

To calculate volume of gas at STP (Standard temperature and pressure) formula will be used

             no. of moles = volume of gas / molar Volume

Rearrange the above equation:

              Volume of gas = no. of moles x molar Volume . . . . . . (1)

where

molar volume at STP = 22.4 dm³/mol

• A. Now to calculate Volume for 7.6 mole Ar

Put value in equation 1

Volume of Ar = 7.6 mol x 22.4 dm³/mol

Volume of Ar = 170.24 dm³

___________

• B. Now to calculate Volume for 0.44 mole C₂H₆

Put value in equation 1

Volume of C₂H₆ = 0.44 mol x 22.4 dm³/mol

Volume of C₂H₆ = 9.9 dm³

___________

• C. Now to calculate Volume for 3.6 mole NH₃

Put value in equation 1

Volume of NH₃ = 3.6 mol x 22.4 dm³/mol

Volume of NH₃ = 80.6 dm³

Answer 2
Final answer:

The volume of the gases at Standard Temperature and Pressure (STP) can be calculated using Avogadro's law. For 7.6 mol of Ar, the volume is 170.24 L. For 0.44 mol of C2H6, the volume is 9.856 L and for 3.6 mol of NH3, the volume is 80.64 L.

Explanation:

To calculate the volume of a gas at Standard Temperature and Pressure (STP), you can use Avogadro's law which states that one mole of any gas will occupy a volume of 22.4 liters.

The calculated volumes of the gases are:

A. 7.6 mol Ar: Volume = (number of moles * volume of 1 mole at STP) = 7.6 * 22.4 L = 170.24 L B. 0.44 mol C2H6: Volume = 0.44 * 22.4 L = 9.856 L C. 3.6 mol NH3: Volume = 3.6 * 22.4 L = 80.64 L

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Related Questions

Suppose 17 grams of sucrose is dissolved into 183 grams of water. What is the concentration of sucrose in ppm?

Answers

Answer:

85 x 10³ ppm  

Explanation:

Data Given:

mass of sucrose = 17 g

mass of water = 183 g

Concentration in ppm = ?

Solution:

Formula Used

                   Concentration (ppm) = Solute / Solution x 10⁶ ............ (1)

**Note : 1 ppm = 1 mg / L

First we have to know about mass of solution

So

       Mass of solution = mass of solute + mass of solvent ................. (2)

Put values in equation 2

        Mass of solution = 17 g sucrose + 183 g water

        Mass of solution = 200 g

Now Put Values in equation 1

          Concentration (ppm) = Solute / Solution x 10⁶

          Concentration (ppm) = 17 g / 200g x 10⁶

          Concentration (ppm) = 0.085 x 10⁶

           Concentration (ppm) = 85 x 10³

Concentration  of sucrose = 85 x 10³ ppm      

         

Final answer:

The concentration of sucrose in the solution is 85,000 parts per million (ppm).

Explanation:

The concentration of sucrose in the given solution can be calculated using the formula:

Concentration (ppm) = mass of solute (g) / mass of solution (g) x 10^6

For this case, the mass of sucrose is 17 grams and the mass of the solution (sucrose + water) is 17 grams + 183 grams = 200 grams. Plugging in the values, we get:

Concentration (ppm) = 17 g / 200 g x 10*6 = 85,000 ppm

Therefore, the concentration of sucrose in the solution is 85,000 parts per million (ppm).

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Total mass of H2O2 in 20 grams of an aqueous H2O2 solution

Answers

Answer:

3=  (x/20.0g) x 100%

or    (20)(0.03)

Answer  0.6g

Final answer:

The total mass of H2O2 in a 20 grams 3.00% aqueous H2O2 solution is 0.6 grams, calculated by taking 3.00% of the total mass of the solution.

Explanation:

To calculate the total mass of H2O2 in 20 grams of a 3.00% aqueous H2O2 solution, use the percentage by mass. The mass of H2O2 can be found by multiplying the total mass of the solution by the percentage of H2O2 in the solution (3.00%).

The calculation is as follows:

Total mass of the solution = 20 gramsPercentage of H2O2 by mass = 3.00%Mass of H2O2 = 20 grams × 3.00% = 0.6 grams

Therefore, the amount of H2O2 in a 20 grams aqueous solution is 0.6 grams.

the continents of earth were clutered to gether in formation that a scientist named what

Answers

Answer:

the continents of earth were clustered together in formation that a scientist named Pangaea.

Explanation:

Before 300 million years ago, our earth was not made up of 7 different continent what we have now. Instead it was single huge mass land that was surrounded by a single ocean called  Panthalassa. A lot of  migration and collision lead to the formation of Pangaea. An Scientist named Albert Wegener gave the name Pangaea. Later, Pangaea was broken into  Gondwanaland and Laurasia.These Lands were then divided into 7 continents.

which of these is true about pure substances?

A. they can only contain one type of atom

B. They can only contain one type of molecule

C. they may contain one type of atom or one type of molecule

D. they can contain different types of atoms and molecules​

Answers

Answer:

They can only contain one type of atoms, one type of molecules or one type of ionic salts

Explanation:

Remember that substances might be made of:

just one type of atoms: the examples would usually be metals, such as sodium metal (Na) consisting of solely sodium atoms, iron (Fe) metal, gold (Au) metal, as well as gases (typically noble gases, He, Ne, Xe, Ar, Kr, Rn);molecules: the examples would be water consisting of [tex]H_2O[/tex] molecules, any gas, such as [tex]O_2, F_2, SO_3, CO_2[/tex] etc.;ions: the examples would involve any salt, such as NaCl, KBr, NaF etc.

That said, pure substances would only contain one type of atoms, one type of molecules or one type of ionic salts. Any additional components of different atoms, molecules or ionic salts would cause a pure substance to become a mixture of several substances.

Answer:

they may contain one type of atom or one type of molecule

What is a coefficient?

Answers

Answer:

Coefficients are the numbers in front of the formulas.

Answer:

a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.

For example, in

7x^{2}-3xy+1.5+y,}{\displaystyle 7x^{2}-3xy+1.5+y,}

Explanation:

GIVING BRAINLIEST!!!!!!!!

Use your knowledge of the law of conservation of mass to answer the following question: In the lab, a student reacts lithium with oxygen to produce lithium oxide. (Lithium + Oxygen -----> Lithium Oxide) How much lithium will be needed to react with 5.4 grams of oxygen to produce 24.6 grams of lithium oxide?

Answers

Answer:

It can't be done.

Explanation:

If you have only 5.4 g of oxygen, the most lithium oxide you can get is 7.7 g.

Only 2.3 g of lithium will react. and the other 22.3 g of lithium will not be used.

What will be kept the same (control) in the test?

Answers

The control variable is the one that is kept same in the test an throughout the test

Explanation:

The scientific constant that is kept constant throughout the experiment is not changed and the value remains constant throughout the experiment and they have strong influence in the results

To test the relationship between the dependent and the independent variables determination of the control variable is necessary and the resulting value changes if the control variables are not kept constant throughout the experiment

This will also bring about the co relationship between dependent variable and the independent variable

Nitrogen gas occupies a volume of 500ml at a pressure of 0.971atm. What volume wi
the gas occupy at a pressure of 1140 mm Hg, assuming the temperature remains
constant?

Answers

Answer: 323.67ml

Explanation:please see attachment for explanation. Thanks

Final answer:

To find the new volume of the nitrogen gas at a different pressure, we can use the gas law equation PV = nRT. By rearranging the equation and plugging in the given values, we can calculate the new volume.

Explanation:

To solve this problem, we can use the gas law equation: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. Since the temperature remains constant, we can simplify the equation to PV = constant. First, we need to convert the pressure from mm Hg to atm by dividing it by 760. Then, we can use the equation to find the new volume:

P1V1 = P2V2

Plugging in the values and solving for V2:

V2 = (P1 * V1) / P2

Let's substitute the given values:
V2 = (0.971 atm * 500 ml) / (1140 mm Hg / 760 mm Hg/ atm)

After converting mL to L and performing the calculation, we get:

V2 = 0.207 L

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the oldest and farthest celestial bodies of the universe

Answers

Answer:

GN-z11 is the oldest

Explanation:

GN-z11 has a spectroscopic redshift of z = 11.09, which corresponds to a proper distance of approximately 32 billion light-years

Globular clusters are some of the oldest structures in the Milky Way, with ages suggesting the age of the universe to be at least around 11 to 13 billion years old. The Boomerang Nebula is among the youngest and coldest objects known. The study of distant galaxies and ancient globular clusters helps astronomers understand the early universe.

The oldest and farthest celestial bodies in the universe provide insight into the universe's early history. Globular clusters are among the oldest structures in our Galaxy, with the youngest being about 11 billion years old, setting a lower limit for the age of the universe. Our Milky Way, containing such ancient globular clusters, suggests it was born at least 13 billion years ago. One famous globular cluster, M13, is roughly 26,000 light-years away from us and has an estimated mass of around a million times that of the Sun. In contrast to these ancient objects, the Boomerang Nebula is a much younger planetary nebula and is currently the coldest known object in the Universe.

In order to understand the early universe, astronomers study not only globular clusters but also very distant galaxies, as they provide a view of the universe when it was very young. Observations of stars in the halo of the Milky Way, red giant stars, suggest distances of almost 1 million light-years, indicating the immense scale and diversity of structures within our galaxy.

The diagram shows a chicken embryo and a human
embryo.

Which is best supported by the diagram

A.Because their embryos have tails, chickens and
humans do not likely share a common ancestor with
fish

B.Because their embryos have structures similar to
gills, chickens and humans likely share a common
ancestor with fish.

C.Chickens and humans have homologous structures
as embryos, so they are not likely related to each
other.

D.Chickens and humans have homologous structures
as embryos, so they are not likely related to any other
organisms.

Answers

Answer:

The correct option is B) Because their embryos have structures similar to

gills, chickens and humans likely share a common  ancestor with fish.

Explanation:

Evolutionary studies show common traits which are present among organisms of different species. Based on these traits, we can tell that which species might have shared common ancestors in the past.

In the structure shown above, we can see that the embryo of a human and a chicken have a structure  similar to the gills of fishes. This shows that these organisms might have shared a common ancestor in the past.

Answer:

The correct answer is B

if 20.0 g of magnesium react with excess Hydro chloric acid how many grams of magnesium chloride will be produced

Answers

Answer:

78.9g

Explanation:

Final answer:

To find the mass of magnesium chloride produced, convert 20.0 g of magnesium to moles, use the reaction's stoichiometry to get the moles of magnesium chloride, and then convert back to grams. The balanced chemical equation for the reaction is Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g), and the result is 78.33 grams of magnesium chloride.

Explanation:

To find out how many grams of magnesium chloride will be produced when 20.0 g of magnesium react with excess hydrochloric acid, we first need to consider the balanced chemical equation for the reaction:

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

From the balanced equation, we see that one mole of magnesium (Mg) reacts with two moles of hydrochloric acid (HCl) to produce one mole of magnesium chloride (MgCl₂) and one mole of hydrogen gas (H₂). To determine the mass of magnesium chloride produced, use the molar mass of magnesium (24.31 g/mol) to convert the mass of magnesium into moles, then use the stoichiometry of the reaction to find the corresponding moles of magnesium chloride produced.

The molar mass of magnesium chloride (MgCl₂) is 95.21 g/mol. After calculating the moles of Mg, that amount will be directly equal to the moles of MgCl₂ formed, since the ratio is 1:1. Finally, convert the moles of magnesium chloride to grams using its molar mass.

The calculation steps are as follows:

Determine moles of Mg: 20.0 g Mg × (1 mol Mg / 24.31 g Mg) = 0.8225 mol MgAccording to the reaction stoichiometry, moles of MgCl₂ produced = moles of Mg reacted = 0.8225 mol MgCl₂Determine the mass of MgCl₂: 0.8225 mol MgCl₂ × (95.21 g MgCl₂ / 1 mol MgCl₂) = 78.33 g MgCl₂

Therefore, 78.33 grams of magnesium chloride will be produced when 20.0 g of magnesium reacts with excess hydrochloric acid.

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A(n) ___chemical equation has the same number of atoms of each element on both sides.
false
balanced
imbalanced
physical

Answers

Answer:

A balanced chemical equation has the same number of atoms of each element on both sides.

Explanation:

This is because of the Law of Conservation of Mass. Therefore, valid chemical equations need to be balanced, in other words, to have the same number of atoms of each element on both sides.

How are
complete ionic and net ionic equations written for chemical reactions in aqueous solution

Answers

Answer:

Explanation:

Balanced Chemical equation:

HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)

Ionic equation:

H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)

Net ionic equation:

H⁺(aq) + OH⁻(aq) → H₂O(l)  

The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

Chemical equation:

NaCl(aq) + KBr(aq)  → NaBr(aq) + KCl(aq)

Ionic equation:

Na⁺(aq)  + Cl⁻(aq) + K⁺(aq)  + Br⁻(aq)  → Na⁺(aq) + Br⁻(aq) + K⁺(aq)  + Cl⁻(aq)

Net ionic equation can not be written for this reaction because nothing is changed on both side. There is no solid, liquid and gaseous product. All are aqueous and cancel each other.

Which of the following shows both the correct formula and correct name of an acid?

Answers

Answer:

Hydrochloric acid (HCl)

Answer: C

Explanation:

in the wave-mechanical model, an orbital is a region of space in an atom where there is

Answers

Answer:

electrons

Explanation:

The orbitals are the spaces around the nucleus.

Neutrons and protons are in the nucleus of an atom, and the electrons revolve around the nucleus.

31. Which of these statements is FALSE?
a. Protons have a positive charge.
b. Electrons are negatively charged and have a mass of 1 amu.
c. The nucleus of an atom is positively charged.
d. The neutron is found in the nucleus of an atom.

Answers

Answer:

The statement which is false is b. Electrons are negatively charged and have a mass of 1 amu.

Explanation:

Protons can be described as the positively charged part of an atom. Neutrons are the part of an atom which do not carry ant charge. The protons and neutrons are present in the nucleus of an atom. The atomic mass unit of a proton and a neutron is almost 1.

Electrons are the negative charge particles of an atom. They do not have a mass of 1 atomic mass unit. Their atomic mass unit is almost zero. Hence, option B is false.

What is the answer to this chemthink?

Answers

Answer:

I think its allow some to leak out into the air and leve it out on a cold day sorry if its wrong <3

Explanation:

During all chemical reactions,mass energy, and charge are...
1.Absorbed
2.Formed
3.Conserved
4.Released

Answers

I believe the answer would be 3( conserved)

Answer:

3

Explanation:

According to law of conservation of mass energy and charge the mass energy and charge will remain conserved.

why are metals conductive?

Answers

Answer:

High density, metallic bonds

Explanation:

We may look at this question from the structural properties of the metals:

metals in their solid states are the most dense phases of all the standard phases we know (solids, liquids and gases). This means the particles within a metal lattice are very closely packed. Both heat and electricity is conducted when particles interact and touch one another, so that either energy or electric current might travel from one particle to the other easily. High density means low distances between the atoms, so they can interact easily;the main reason, however, is the fact that metals form metallic bonds, also known as 'sea of electrons'. We have metal cations floating in a sea of their valence electrons. This forms a medium in which both heat and electricity can travel easily.

The expression of 5522 km in scientific notation is​

Answers

Answer:

5.522 * 10^3.

Explanation:

5522 = 5.522 * 10^3 .

Which of these statements best explains why the ocean currents in the Northern hemisphere tend to move in the clock-wise direction? (2 points) Question 14 options: 1) The currents deflect to the right due to the rotation of Earth. 2) The change in gravitational forces causes currents to move towards right. 3) The deflection of winds to the left causes the currents to move in the opposite direction. 4) The altered wind speed due to Earth's rotation causes the movement of ocean water.Which of these statements best explains why the ocean currents in the Northern hemisphere tend to move in the clock-wise direction? (2 points) Question 14 options: 1) The currents deflect to the right due to the rotation of Earth. 2) The change in gravitational forces causes currents to move towards right. 3) The deflection of winds to the left causes the currents to move in the opposite direction. 4) The altered wind speed due to Earth's rotation causes the movement of ocean water.

Answers

Answer: Option (1) is the correct option that is currents deflect to the right due to the rotation of Earth.

Explanation:

The water on the surface of ocean is moved by winds that blow in certain direction because of the Coriolis effect and spinning of the Earth that's why ocean currents in the Northern hemisphere tend to move in the clock-wise direction.

A 6-column table with 2 rows. The first column labeled number of washers has entries 1, 3. The second column labeled Mass of Washers m subscript w (grams) has entries 4.9, 14.7. The third column labeled Mass of Washers m subscript w (kilograms) has entries 0.0049, empty. The fourth column labeled Acceleration due to Gravity a subscript g (meters per seconds squared) has entries empty, 10. The fifth column labeled Force of gravity on the washers F subscript g (kilograms times meters per second squared) has entries 0.049, 0.147. The sixth column labeled Applied force of washers on the car F subscript w c (Newtons) has entries 0049, empty.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


A) The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be ___ m/s2.


B) The mass of 3 washers, when converted to kg, is ___ kg.


C) The applied force of 3 washers will increase the applied force on the car to ___ N.


Please find the blanks, thank you!

Answers

Answer:

Your answer is:

Explanation:

A) The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be  10  m/s2.

B) The mass of 3 washers, when converted to kg, is  0.0147  kg.

C) The applied force of 3 washers will increase the applied force on the car to 0.147  N.

I hope this helps!

- sincerelynini

Answer:

A) 10 m/(s^2)

B) 0.0147 kg

C) 0.147 N

Explanation:

A) It's stated in the table that the acceleration due to gravity is assumed as 10 m/(s^2).  If you assume this value in one calculation, then you have to assume the same value in all your calculations.

B) 3 washers have a mass of 14.7 grams. Dividing this mass by 1000, you convert grams into kilograms, that makes 0.0147 kg.

C) Force measured in kilograms times meters per second squared are equivalent to Newtons, therefore, 0.147 kg*m/(s^2) = 0.147 N

find the solution for 4x+7=22+x​

Answers

Answer: X = 5

Explanation: 4x + 7 = 22 + x​

Collect like terms

4x — x = 22 — 7

3x = 15

3x/3 = 15/3

X = 5

what is the molarity of a 5.0 L solution that contains 0.5 moles of KNO3

Answers

The molarity of the KNO3 solution is 0.1 M.

To calculate the molarity of a KNO3 solution, we use the formula for molarity:

Molarity (M) = moles of solute / liters of solution

In this case:

Moles of KNO3 = 0.5 moles

Volume of solution = 5.0 L

Using the formula:

Molarity (M) = 0.5 moles / 5.0 L = 0.1 M

The molarity of the KNO3 solution is 0.1 M.

Help please!
Pretend you have a job building tricycles. If you had 200 handle bars, 150 wheels,
250 pedals, and 75 seats. What is the limiting reactant?

Answers

Answer:

Correct answer - wheels

Explanation:

Limiting reactant:

The reactant that is used up first in the chemical reaction.i.e. the reactant that restricts the amount of product that can be produced.The unused product left in the reaction.

For example,

[tex]2H_{2}+O_{2}\rightarrow 2H_{2}O[/tex]

The ratio of creating [tex]H_{2}O[/tex] is

[tex]2molH_{2}:1molO_{2}:2molH_{2}O[/tex]

If you had 8 moles of hydrogen and only 3 moles of oxygen ;you would have enough oxygen to produce 6 moles of water with 2 moles of hydrogen leftover.

From the given,

200 handle bars, 150 wheels,  250 pedals, and 75 seats.

For tricycle making, each one required one seat, handle,two pedals and three wheels.

Hence, wheels are first consumed.

Therefore,  wheels are limiting reactant.

Determine the number of ions produced in the dissociation of the compound listed. CaCl2

Answers

Answer:

See the explanation below, please.

Explanation:

Then the dissociation of the compound CaCl2 (Calcium chloride):

CaCl2 ---> Ca 2+ + 2Cl -

The compound dissociates into Ca2 + and Chloride (Cl-)

(two ions are generated in dissociation)

Answer:

The answer is 2 ions

Explanation:

Which of the following is a physical property of copper

Answers

Physical properties of copper metal are high thermal conductivity, high electrical conductivity, ductility, malleability etc.

A physical property is a characteristic of matter that can be observed or measured without changing the substance itself. Examples include color, shape, density, and melting point.

Copper is a metal that has several physical properties that make it useful in various applications. Some of the physical properties of copper are:

1. High thermal conductivity: Copper is an excellent conductor of heat, which makes it useful in various applications such as electrical wiring, plumbing, and heating systems.

2. High electrical conductivity: Copper is also an excellent conductor of electricity, which makes it useful in electrical wiring and other electrical applications.

3. Ductility: Copper is a highly ductile metal, which means it can be easily drawn into wires or other shapes without breaking.

4. Malleability: Copper is a highly malleable metal, which means it can be easily shaped or flattened into thin sheets.

5. Corrosion resistance: Copper is resistant to corrosion, which makes it useful in various applications where it is exposed to moisture or other corrosive materials.

In conclusion, high thermal conductivity, high electrical conductivity, ductility, malleability are the physical properties possessed by copper.

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Final answer:

A physical property of copper includes its malleability, ductility, high thermal and electrical conductivity, and its characteristic pinkish-orange color when freshly exposed.

Explanation:

The question involves identifying a physical property of copper. A physical property can be observed or measured without changing the substance's identity. For copper, some of its physical properties include its reddish-brown color, malleability, ductility, and high thermal and electrical conductivity. Since copper is such a good conductor of electricity, it is often used in electrical wiring. Being ductile, it can be stretched into wires without breaking. Copper's pinkish-orange color when freshly exposed is another key physical property.

Which statement is true about the activity series? (5 points)

Elements are listed according to their reactivity.
Elements are listed according to their atomic number.
Elements are listed according to their atomic radius.
Elements are listed according to their atomic mass.


Which of the following statements is true about nuclear fusion? (5 points)

It occurs in the sun.
A heavy atom is split.
It can be controlled easily.
An electron is lost by the atom.

The table shows four reactions.

ReactionsReaction Equation
1 C3H8 + 5O2 → 3CO2 + 4H2O
2 C6H12O6 + 6O2 → 6CO2 + 6H2O
3 AgNO3 + NaCl → AgCl + NaNO3
4 2Fe + O2 → 2FeO


Which of the above reactions is an example of a combustion and also a synthesis reaction? (5 points)

1
2
3
4


Answers

Answer: Correct statements are given below:

1) In activity series elements are listed according to their reactivity.

2) Nuclear reaction in which low atomic nuclei fuse to form a heavier nucleus with the release of energy. Nuclear fusion reaction occurs in the sun.

3) C3H8 + 5O2 → 3CO2 + 4H2O is the example of a combustion reaction.

4) 2Fe + O2 → 2FeO is the example of synthesis reaction. In synthesis reaction is a type of reaction in which two reactants combine to form a single product.

The activity series is an arrangement of elements in order of reactivity.

The activity series is an arrangement of elements in order of reactivity. The activity series shows the order in which chemical elements will displace each other in a replacement reaction.

A nuclear fusion is said to have occurred when two light nuclei come together to yield a heavier nucleus with the emission of a tremendous amount of energy. Nuclear fusion occurs in the sun.

A combustion reaction refers to the reaction of a substance with oxygen. A synthesis reaction is a reaction in which two or more substances come together to form a new substance. A combustion reaction which is also a synthesis reaction is 2Fe + O2 → 2FeO.

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How much heat in j is giving out when 85.0g of lead cools from 200.0 c to 10.0c

Answers

Answer:

q = - 2067.2 J of Heat is giving out when 85.0g of lead cools from 200.0 c to 10.0 c.

Explanation:

The Specific Heat capacity of Lead is 0.128 [tex]\frac{J}{g\ ^{0}C}[/tex]

This means, increase in temperature of 1 gm of lead by [tex]1 ^{0}\ C[/tex] will require 0.128 J of heat.

Formula Used :

[tex]q = m.c.\Delta T[/tex]

q = amount of heat added / removed

m = mass of substance in grams = 85.0 g

c = specific heat of the substance = 0.128

[tex]q = m.c.\Delta T[/tex] = Change in temperature

                                          = final temperature - Initial temperature

                                          = 10 - 200

                                          = -[tex]190 ^{0}\ C[/tex]

put value in formula

q = -  [tex]85\times 0.128\times 190[/tex]

On calculation,

q = - 2067.2 J

- sign indicates that the heat is released in the process

In an experiment, 9 g of aluminum react with 8 g of sulfur to form aluminum sulfide. Calculate the grams of aluminum sulfide formed. Al + S → Al2S3

Answers

Answer:

The grams of aluminum sulfide formed are ; 12.51 g

Explanation:

Using Formula,

[tex]mole = \frac{given\ mass}{Molar\ mass}[/tex]

Calculate the moles of Al and S :

Given  mass of Al = 9 g

Molar mass of Al = 27 g/ mole

[tex]mole = \frac{9}{27}[/tex]

Mole of Al = 0.33

Given  mass of S =  8 g

Molar mass of S = 32 g/mole

[tex]mole = \frac{8}{32}[/tex]

Mole of S  = 0.25

The balanced chemical equation for the reaction between aluminium and sulfur is :

[tex]2Al(s) + 3S(s)\rightarrow Al_{2}S_{3}(s)[/tex]

Here ,

2 mole of Al needs 3 moles of S

1 mole  of Al needs 3/2(= 1.5) moles of S

hence  ,

0.33 mole of Al should require

[tex]\frac{3}{2}\times 0.33[/tex] moles of S

Sulfur needed = 0.495 mole

Available S = 0.25 mole

So there is less sulfur than required , S is the limiting reagent

Amount of S decide the Amount of Al2S3 formed

3 mole of S produce 1 mole of Al2S3

1 mole of S produce 1/3 mole of Al2S3

0.25 mole will produce :

[tex]0.25\times\frac{1}{3}[/tex]

= 0.0833 moles of Al2S3

[tex]Al_{2}S_{3}[/tex] = 0.083 mole

Molar mass of

[tex]Al_{2}S_{3}[/tex] = 150.16 g/mole

[tex]mole = \frac{given\ mass}{Molar\ mass}[/tex]

[tex]given\ mass = moles\times molar\ mass[/tex]

[tex]given\ mass = 0.083\times 150.16[/tex]

= 12.51 g

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