7.50 g of a compound that contains hydrogen, carbon and oxygen, which produces 11.0 g of carbon dioxide and 4.5 g of water when burned, contains 0.25 moles of carbon in the original sample.
Further Explanation: A compound A compound is a substances that contains two or more different atoms that are bonded together. When the atoms are similar the substance is known as a molecule, therefore not all molecules are compounds. Hydrocarbons Hydrocarbons are compounds that contains hydrogen and carbon as the only elements. Other hydrocarbons are composed of hydrogen, carbon and oxygen elements. When hydrocarbons are burned in air, they form carbon dioxide and water:That is;
CxHyOn + O2 = CO2 + H2O
Moles of carbon in the original sample of a Hydrocarbon
We can calculate the original number of moles in the original sample of the hydrocarbon.In our case:
Mass of CO2 formed is 11.0 g
Mass of the hydrocarbon is 7.5 g
Mass of carbon:
1 mole of CO2 contains 12.0 g of carbon
44.0 g/mol contains 12.0 g of carbon
Hence; 11.0 g of CO2 will contain;
= (11x 12)/44.0g
= 3 g of carbon
This means; the original mass of Carbon in 7.5 g of the hydrocarbon is 3 g
Number of moles = mass/R.A.M
= 3 g/ 12.0 g/mol
= 0.25 moles
Hence; 7.5 g of the hydrocarbon contained 0.25 moles of carbon.
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Level: High school
Subject: Chemistry
Topic: Empirical formula and molecular formula
To determine the number of moles of carbon in the original sample, we need to use the balanced equation for the combustion reaction. The original sample contained 11.0 moles of carbon.
Explanation:To determine the number of moles of carbon in the original sample, we need to use the balanced equation for the combustion reaction. From the reaction, we can see that 1 mole of CO2 is produced for every 1 mole of carbon in the compound. So, if 11.0 g of CO2 is produced, it means that there are also 11.0 moles of carbon in the compound. Therefore, the original sample contained 11.0 moles of carbon.
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What name should be used for the ionic compound Pb(SO4)2
What is the layerof the sun in which energy is produced.?
Given the reactant side of the total ionic equation for the neutralization reaction of sodium hydroxide (NaOH) with hydrochloric acid (HCl), write the total ionic equation (also known as the complete ionic equation) by entering both the reactant and the product species, separated by the reaction arrow. Na+(aq)+OH−(aq)+H+(aq)+Cl−(aq)→ ? Be sure to include the charges on the ionic species and the physical state of all the reactant and product species. Express your answer as a chemical equation.
Final answer:
The complete ionic equation for the neutralization of HCl by NaOH is Na+ + OH- + H+ + Cl- → H2O + Na+ + Cl-. The net ionic equation, omitting the spectator ions Na+ and Cl-, is H+ + OH- → H2O.
Explanation:
The total ionic equation for the neutralization reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is written as:
Na+ (aq) + OH− (aq) + H+ (aq) + Cl− (aq) → H₂O(l) + Na+ (aq) + Cl− (aq)
In this reaction, the Na+ and Cl− ions are spectator ions and do not participate in the actual neutralization. Thus, the net ionic equation, which shows the actual chemical change, is simply:
H+ (aq) + OH−(aq) → H₂O(l)
Here, the hydrogen ion (H+) from the acid reacts with the hydroxide ion (OH−) from the base to form water (H₂O), which is the only non-ionic product.
Is SiO2 Polar or Non-polar?
Silicon dioxide (SiO₂), also known as silica, is a non-polar molecule.
A non-polar molecule is a molecule that has an even distribution of electrical charge, meaning it does not have a positive or negative end.
The molecule's geometry and symmetry lead to its non-polar nature. SiO₂ consists of one silicon atom bonded to two oxygen atoms, forming a linear structure. The oxygen atoms are positioned on opposite sides of the silicon atom, resulting in a symmetric arrangement.
As a result, the bond dipoles cancel each other out, resulting in a non-polar molecule overall.
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What is the driving force for water to freeze below 0 degree C? what is the driving force for ice to melt above 0 degree C? ...?
Explanation:
When the water freezes, the variable which changes is the temperature because as we reduce the temperature, the particles will come closer to each other and the average kinetic energy of the particles of water decreases. Hence, the water freezes below 0°C.
In the case of melting, the temperature is increased which means that the particles move away from each other and the average kinetic energy of the particles of water at this temperature increases. Hence, the water melts above 100°C.
In chemistry class, you are given a density column with golden syrup, water, and oil. Your teacher gives you an unknown substance. The unknown substance is a solid, and it has been determined that the density of the unknown is 7.50 g/cm3. If this unknown solid was placed into the density tube, which of these best describe the outcome?
A) It would float on top of the oil.
B) It would sink directly to the bottom.
C) It would rest between the oil and the water.
D) It would float between the oil and the golden syrup.
Answer:
The correct answer is option B) It would sink directly to the bottom.
Explanation:
Hello!
Let's solve this!
Generally, solids have a higher density than liquids. In this case the densities are differentiated between the syrup, the oil and the water.
I think the solid would sink to the bottom.
After the explanation, we conclude that the correct answer is option B) It would sink directly to the bottom.
For the following metal and non-metal combination reaction you have 3 moles of Na. How many moles of Cl2 would you need to add to have stoichiometrically equivalent amounts of NA and Cl2?
2Na(s) + Cl2(g) --> 2NaCl(s)
The moles of [tex]\rm Cl_2[/tex] needed to have stoichiometrically equivalent amounts of Na and [tex]\rm Cl_2[/tex] is 1.5 moles.
What is stoichiometrically equivalent?Stoichiometrically equivalent is defined as a definite quantity of one substances reacted with the definite quantity of other substances represented in the equation.
It can also be defined as the relationship between the quantities of reactant and product before, during and following equation.
The ratio of [tex]\rm NaCl_2[/tex] is 1:2 because in [tex]\rm NaCl_2[/tex] there is only one mole Na ion is present and 2 mole of Cl ion is present.
Thus moles of Na present = 3 moles
So, 2 / 1 = 3 / x
x = 3 / 2
x = 1.5 moles
Thus, the moles of [tex]\rm Cl_2[/tex]needed to have stoichiometrically equivalent amounts of Na and[tex]\rm Cl_2[/tex] is 1.5 moles.
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Which contributes to the dissolution of sugar in water?
a. the dissociation of an ionic compound in water
b. a strong pull of water molecules on an ionic compound
c. the dissociation of a polar covalent compound in water
d. a strong pull of water molecules on a polar covalent compound
Option C: The dissociation of a polar covalent compound in water.
Sugar is made up of sucrose molecules containing polar covalent bonds. They have same type of oxygen-hydrogen covalent bonds that are present in water.
Since, sugar is not an ionic compound, option a and option b are incorrect. Also, due to same type of bonding in water and sugar molecules there will be no such force of attraction between them, this will opt out the option d.
Thus, dissolution of sugar in water is the dissociation of a polar covalent compound in water and option c is correct.
Final answer:
The dissolution of sugar in water is due to the strong pull of water molecules on a polar covalent compound, like sugar, and is best explained by option d.
Explanation:
The dissolution of sugar in water is best described by option d, a strong pull of water molecules on a polar covalent compound. Sugar molecules are classified as polar covalent compounds because they contain regions of hydrogen-oxygen polar bonds. Due to the polarity of the water molecule, it can interact with these polar regions within sugar molecules through intermolecular forces. These interactions facilitate the separation of the sugar molecules into the solution, where they are surrounded by water molecules, leading to dissolution.
Water itself is a polar molecule, having a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. Water molecules can surround the sugar molecules, aligning their charges with the opposite charges in the sugar molecule. This is what strongly pulls the sugar molecules apart and allows them to interact with more water molecules until they are evenly dispersed — thus the sugar is dissolved in the water due to the hydration process.
How many moles is 15.8 cm3 of platinum? The density of platinum is 21.45 g/cm3.
The mass of platinum taken here is 338.9 g. The mass of one mole of platinum is 195 g. Then , number of moles in 338.9 g is 1.73.
What is platinum ?Platinum is 78th element in periodic table. It is a transition metal in d -block. Platinum is a precious metal used in making of ornaments, electrical devices etc.
volume Pt = 15.8 cm³
density = 21.4 g/ cm³
mass = volume × density = 338.9 g.
Atomic mass of platinum = 195 g/mol.
The mass of one mole of platinum metal is 195 g. Then the number of moles in 338.9 g can be calculated as follows:
no.of moles = weight/ atomic mass
n = 338.9 g / 195 g/mol
= 1.73 moles.
Therefore the number of moles of Pt is 1.73.
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Why must living things rely on thousands of catalysts for chemical reactions necessary for life?
How many times does the digit 1 appear in the number 500, solution please
...?
According to the periodic law, what is the relationship between elements and periods?
A. Elements have the same physical and chemical properties in any period.
B. Element properties repeat from period to period.
C. Elements in a period have the same physical properties.
D. Elements in a period have the same chemical properties.
how much heat is released by 38 gram sample of water to freeze
When a 38 gram sample of water freezes it releases approximately 12.66 kJ of heat. This is because freezing is an exothermic process, meaning the substance releases energy in the form of heat.
Explanation:The process of freezing water is exothermic, meaning it releases heat. The amount of heat released when water freezes can be calculated using its enthalpy change upon freezing. For water, the enthalpy change upon freezing is approximately -6.0 kJ/mol. Here's how to calculate:
First, make sure that you have the appropriate conversion factors. Given that the molar mass of water is 18.015 g/mol, a 38 gram sample of water would be approximately 2.11 moles.Now use this information with the enthalpy change upon freezing (which is -6.0 kJ/mol) to calculate the amount of energy change (which will be measure in kJ). Multiply the number of moles by the enthalpy change: 2.11 moles * -6.0 kJ/mol = -12.66 kJ (negative because heat is being released). So, a 38 gram sample of water would release approximately 12.66 kJ of heat when it freezes.Learn more about Heat of freezing here:https://brainly.com/question/32765057
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When a 38 gram sample of water freezes it releases approximately 12.66 kJ of heat.
This is because freezing is an exothermic process, meaning the substance releases energy in the form of heat
To freeze a 38-gram sample of water, 12,692 joules of heat is released, calculated using the latent heat of fusion for water which is 334 J/g.To determine the amount of heat released when a 38-gram sample of water freezes, we must use the latent heat of fusion. The heat of fusion for water is 334 J/g. This value represents the amount of heat energy released or absorbed during the phase change of water from liquid to solid, and vice versa, without changing temperature.The formula to calculate the heat released is:
Heat released (Q) = mass (m) x heat of fusion (Lf)Given that: m = 38 grams and Lf = 334 J/g, we can plug in the values:
Q = 38 g x 334 J/g = 12,692 JTherefore, 12.66 kJ of heat is released when a 38-gram sample of water freezes.
Correct question is: How much heat is released by a 38-gram sample of water to freeze at its freezing point?
A compound contains 69.94 percent iron and 30.06 percent oxygen. What is its molecular formula if the molar mass of the compound is 199.55 grams per mole?
Answer:
The molecular formula is Fe₂O₃
Explanation:
The molar mass of the compound is 199.55 g/mol; this means that if we have 1 mol of the compound, we'd have 199.55 g, we'd also have:
199.55 * 69.96/100 = 139.57 g of iron199.55 * 30.06/100 = 59.98 g of oxygenNow we calculate the moles of each element present in the given masses, using their atomic masses:
139.57 g Fe ÷ 55.84 g/mol = 2.50 mol Fe59.98 g O ÷ 16 g/mol = 3.75 mol OThen in 1 mol of the compound, there's 2.50 mol Fe and 3.75 mol O:
Fe₂.₅O₃.₇₅We convert the coefficients into integers (Divide them by the lowest number among them and multiply them by two):
Fe₂O₃ 17. When does radioactive decay occur?
A. when an atom gains electrons
B. when neutrons accumulate in the nucleus
C. when the nucleus decays
D. when an atom loses electrons
18. Why does radioactive decay occur?
A. Nuclear forces disintegrate protons.
B. The electric force and nuclear forces are in opposition to each other.
C. The electric force causes electrons to be released.
The correct options are as follows:
17. C.
Radioactive decay refers to the process by which an unstable atomic nucleus loses energy by giving out radiations. The radiations emit can be in form of alpha or beta particles or gamma rays. Radioactive decay is a random process, that is, one can not predict when it would happen. Radioactive decay occurs when the nucleus of an atom decay and no longer have enough binding energy to hold the atomic sub particles together.
18. B.
Radioactive decay occurs when the nucleus no longer have enough energy to hold the sub particles in the nucleus together. This situation always occur when there are excess protons or neutrons in the nucleus of the atom. In the nucleus of an atom, two forces are usually at work, nuclear and electrostatic forces. While proton experience both of these forces, neutron only experience the nuclear force. These two forces that are in opposition bring about radioactive decay.
Radioactive decay occurs when the nucleus of an atom decays. The correct answer is
C: when the nucleus decays.Radioactive decay occurs due to the electric force and nuclear forces being in opposition to each other.
B: The electric force and nuclear forces are in opposition to each other. What is Radioactive decayRadioactive decay involves the spontaneous transformation of unstable atomic nuclei into more stable configurations, resulting in the emission of particles or electromagnetic radiation.
Reasons
In an atomic nucleus, protons are positively charged particles, and they experience repulsive electric forces due to their like charges. However, nuclear forces, specifically the strong nuclear force, help hold the protons and neutrons together in the nucleus. When the balance between these forces is disrupted, such as when the nucleus becomes unstable, radioactive decay can occur as the nucleus seeks a more stable configuration.
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An ion is neutral and has no charge.
True
False
Answer:false
Explanation:
Find the number of moles of water that can be formed if you have 150mol of hydrogen gas and 70mol of oxygen gas.
what do gamma rays consists of?
A.only electrons
B.pure energy
C.only protons
D.beta particles
In the given question, Gamma rays consist of pure energy. The correct answer is option B.
Gamma rays are electromagnetic radiation with very high frequency and short wavelength.
They have no mass or charge, and are not considered particles like electrons, protons, or beta particles. Gamma rays are produced by the decay of atomic nuclei and are often associated with nuclear reactions such as those that occur in the sun, in nuclear power plants, or in nuclear weapons.
Therefore, Gamma rays are option B. "pure energy" in the form of electromagnetic radiation with an extremely high frequency and short wavelength.
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Derek needs a tool that delivers 25.00 mL of a sodium hydroxide solution. What tool would be best for him to use?
The best tool for Derek to use for delivering 25.00 mL of a sodium hydroxide solution is a volumetric pipette. Volumetric pipettes ensure precise volume measurements needed in laboratory settings.
To accurately measure and deliver 25.00 mL of a sodium hydroxide solution, the best tool for Derek to use is a volumetric pipette. Volumetric pipettes are specifically designed for precise volume measurements and are commonly used in laboratory settings to ensure accuracy.
Here’s a step-by-step guide on how Derek can use the volumetric pipette:
Rinse the volumetric pipette with the sodium hydroxide solution to ensure there is no contamination.Fill the pipette carefully with the sodium hydroxide solution up to the calibration mark.Dispense the solution into the desired container by allowing the liquid to drain out naturally without forcing it.By using a volumetric pipette, Derek can be confident that he has delivered exactly 25.00 mL of the sodium hydroxide solution, which is critical for accurate chemical preparations and reactions.
Which has a higher frequency, a neutron or electron? Why?
how many grams of mercury are present in a barometer that holds 6.5mL of mercury? ...?
Answer: The mass of mercury will be 20.15 g.
Explanation:
Density is defined as the mass contained per unit volume.
[tex]Density=\frac{mass}{Volume}[/tex]
Given : Mass of bromine = ?
Density of bromine= [tex]3.1g/ml[/tex]
volume of bromine = 6.5 ml
Putting in the values we get:
[tex]3.1g/ml=\frac{mass}{6.5ml}[/tex]
[tex]mass=20.15g[/tex]
Thus the mass of bromine is 20.15 g.
A 0.1 M solution enatiomerically pure chemical compound D has an observed rotation of 0.20 degrees in a 1 atm sample container. The Molecular mass of the compound is 150.
a. What is the specific rotation of D?(I already know this part )
b. What is the observed rotation if this solution is mixed with an equal volume of a solution that is 0.1 M in L, the enantiomer of D?
c What is the observed rotation if the solution of D is diluted with an equal volume of solvent?
d What is the specific rotation of D after the dilution described in c?
The mixing of enantiomers D and L yields a zero-degree observed rotation. Dilution of D with solvent maintains the same observed rotation, and also doesn't change the specific rotation.
Explanation:Enantiomeric compounds D and L are mirror images of each other, thus they will rotate plane-polarized light equally but in opposite directions. Therefore, when these are mixed in equal volumes, the rotation of one enantiomer will cancel out the rotation of the other, resulting in an observed rotation of 0 degrees.
The solution's concentration is being halved when the solution of D is diluted with an equal volume of solvent. But, because the observed rotation is directly proportional to the path length and inversely proportional to the concentration, the observed rotation will remain the same at 0.20 degrees, because you're essentially doubling the path length while halving the concentration.
The specific rotation will stay the same i.e 0.20 degrees after the dilution in question c), because it is an intrinsic property of the substance D and does not change with concentration or path-length.
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In a chemical reaction, water decomposes to form hydrogen and oxygen. What is the correct term for the water?
A.
an element
B.
an atom
C.
a product
D.
a reactant
You have two solutions of copper sulfate, one a deep blue and the other much paler. Is the first or second likely to be more concentrated? Is the first or
second likely to have higher absorbance
What is the name for the point at which the indicator changes color in a titration?
Answer:
End point.
Explanation:
The end point is the point at which the indicator changes color in a titration.
The end point generally lags behind the neutralization point in a reaction where we have taken acidic or basic indicator.
Indicators show a change or appearance in color at particular pH. This pH is achieved after point of neutralization. However for some indicators the change in color can also be observed at point of neutralization or completion of reaction exactly. In that case equivalence point and end point will coincide.
Which of these equations is balanced?
a. h2o co ---> h2co3
b. 2nacl h2so4 ----> na2so4 2hcl
c. 2cao h2o ----> ca(oh)2
d. mn fe ----> mns fe?
Which of the following is likely to be a polar compound?
A. CHCl3
B. CCl4
C. CO2
D. CH4
Answer:
A) CHCl3
Explanation:
Polarity arises due to the difference in the electronegativity between two atoms forming a chemical bond. This difference also creates a dipole. A molecule is said to be polar if it has a net dipole moment. In symmteric molecules the dipole moments tend to cancel out making them non-polar.
A) CHCl3 is a tetrahedral molecule in which the central C atom is bonded to 3 Cl and 1 H atom. This molecule is not symmteric since there are 3 C-Cl and C-H bonds. Therefore, it will have a net dipole and will be polar
B) CCl4 is also a tetrahedral molecule, but symmetric in nature. Hence it will be non-polar
C) CO2 is a linear molecule where the dipole moments cancel out making it non-polar
C) CH4 is also a tetrahedral molecule and symmetric in nature. Hence it will be non-polar
A. CHCl₃ (chloroform) is the polar compound due to its tetrahedral structure with non-identical atoms and the resulting imbalance in electron distribution.
The compound likely to be a polar compound is CHCl₃. CHCl₃, or chloroform, is a polar molecule due to the uneven distribution of charge within its tetrahedral structure. Although the molecule has a tetrahedral geometry, the atoms bonded to the central carbon are not identical; there is one hydrogen and three chlorine atoms. Chlorine is more electronegative than carbon, and carbon is more electronegative than hydrogen, resulting in polar C-Cl bonds with a larger bond moment compared to the C-H bond. The difference in electronegativity and the arrangement of the atoms causes the bond dipole moments not to cancel out, yielding an overall dipole moment for the molecule. In contrast, molecules such as CCl₄ and CO₂ have symmetrical shapes and equal sharing of electrons, which result in nonpolar characteristics, while CH₄ also has a symmetrical tetrahedral structure with no significant differences in the electronegativity of the bonded atoms, rendering it nonpolar as well.
If 4.00 moles of gasoline are burned, what volume of oxygen is needed if the pressure is 0.93 ATM, and the temperature is 35.0 degrees Celsius?
A common product of acid-base neutralization reaction is
Final answer:
A common product of acid-base neutralization reaction is water and a salt.
Explanation:
A common product of acid-base neutralization reaction is water and a salt. In this reaction, an acid and a base react to form a salt and water. For example, when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the products are sodium chloride (NaCl) and water (H2O).
In an atom of barium, how many electrons have l = 0 and ml = 1.
Answer: 12 electrons
Explanation:
As the electrons move around the atom, they can move in any direction as long as they stay in their shell, and they are also constantly spinning. Shells or orbitals are specific distances from the nucleus and they are energy levels. Each of those shells has a name and there are a many ways that atomic shells are described.
First, the basic regions where electrons are found which is described using an "n" value, or the letters K, L, M, N, O, P, and Q. The "K" shell is the one closest to the nucleus, and "Q" is the farthest away. The second description looks at how electrons act inside of the shells, described with the "l" value which indicates in which suborbital an electron is found in (s, p, d, f, g, and h)
Quantum numbers are numbers associated with physical quantities conserved in certain quantum systems.
The main quantum number n This quantum number is related to both energy and the average distance between the nucleus and the electron. The values of this number, which corresponds to the number of the energy level, vary theoretically between 1 and infinity, but only atoms are known that have up to 8 energy levels in their fundamental state since the atomic number and the main quantum number are related by 2n2 = Z < 110.The secondary quantum number is L (l = 0,1,2,3,4,5,...,n-1), it indicates the shape of the orbitals and the sublevel of energy in which the electron is found. l = 0: Suborbit "s" (circular shape), it has a space for two electrons. l = 1: Suborbit "p" (flattened semicircular shape), it has three spaces for six electrons. l = 2: Sub-orbit "d" (lobular shape, with a nodal ring), it has five spaces for ten electrons. l = 3: Sub-orbit "f" (lobular with radial nodes), it has seven spaces for fourteen electrons. l = 4: Sub-orbit "g" (*), l = 5: Sub-orbit "h"The magnetic quantum number (m, ml), indicates the spatial orientation of the energy sublevel, "(m = -l,...,0,...,l)". For each value of l there are 2l+1 values of m.The spin quantum number (s, ms), Describes the intrinsic angular momentum of the electron. This angular momentum was originally interpreted in a classical way as the "self-rotation" of the electron on itself, and it was considered that given an axis the electron could do in two directions, opposite to each other. Therefore, the values that the spin quantum number can take are -1/2 and +1/2. In other words, each electron, in an orbit, spins on itself.So, L refers to the s subshell, so L=0 is related with the S-subshell. Ba is an atom found in the 6th shell, and it has the electronic configuration of [Xe]6s2 (1s2s2p3s3p4s3d4p5s4d5p6s), so there would be .12 electrons there because there are 6 s-orbitals with 2 electrons each. On the other hand, ml values rage from -L to L, and since the L value from this question is 0, there are no electrons that have both values of L=0 and ml=1. Since only one orbital of each type can have this magnetic quantum number and each orbital can host 2 electrons, we also have 12 electrons fitting this description.