4. 1.00 mole of Ca(NO3)2 contains the same mass of N as 1.00 mole of NaNO3. True or False 5. The theoretical yield of a reaction is generally less than the actual yield. True or False

6. Which of the following statements is/are TRUE concerning the "mole"? (a) One mole of a substance contains as many particles as exactly 12 amu of carbon-12. (b) One mole of a substance contains 6.022 x 1023 particles of that substance. (c) There are 6.022 x 1023 carbon atoms in 12.00 g of carbon-12. (d) Because it is heavier, a mole of iodine atoms contains more particles than a mole of bromine atoms.

7. The reaction of sulfuric acid with hematite (Fe2O3) , a common mineral, produces iron (III) sulfate and water, as follows: .
Fe2O3 + H2SO4 > Fe2(SO4)3 + H2O

When this equation is balanced, it will contain the following term(s) with the appropriate coefficient: (a) 3 H2SO4 (b) 2 Fe2O3 (c) Fe2(SO4)3 (d) 4 H2O

8. In a recent year, electric power plants in the US consumed 1.14 x 1011 kg of natural gas. Assume that natural gas is entirely methane, CH4, and calculate the number of hydrogen atoms in this amount. (a) 4.56 x 1011 atoms H (b) 1.71 x 1037 atoms H (c) 2.84 x 1013 atoms H (d) 4.28 x 1036 atoms H If you could also explain how you get the answer that would be really helpful

4. False

5. False.

6. (b) One mole of a substance contains 6.022 x 10²³ particles of that substance

(c) There are 6.022 x 10²³ carbon atoms in 12.00 g of carbon-12.

7.  The correct option is (A) 3H₂SO₄

8. (b) 1.71 * 10³⁷ atoms of hydrogen

Explanation:

4. 1.00 mole of Ca(NO3)2 contains the same mass of N as 1.00 mole of NaNO3 is False  because 1 mole of Ca(NO3)2 contains 2 moles (28 g) of N atoms whereas 1 mole of NaNO3 contains 1 mole (14 g) of N atoms

5. The theoretical yield of a reaction is generally less than the actual yield is False  because it is the actual yield of a reaction that is always less than the theoretical yield due to some incomplete reactions.

The actual yield is obtained from carrying out the actual reaction while the theoretical yield is calculated from the equation of the reaction.

6. A mole of a substance is defined as the amount of that substance which contains as many elementary particles as there are in 12 g of carbon-12.

From experiments, it was discovered that 12 g of carbon -12 contains 6.02 * 10²³ atoms, therefore, a mole of a substance can also be defined as the amount of that substance which contains 6.02 * 10²³ particles of that substance.

(a) One mole of a substance contains as many particles as exactly 12 amu of carbon-12 is false because 12 amu is the mass of 1 atom of carbon-12 and not a mole of carbon-12.

(b) One mole of a substance contains 6.022 x 1023 particles of that substance is true from the definitions above

(c) There are 6.022 x 1023 carbon atoms in 12.00 g of carbon-12 is true from the definitions above.

(d) Because it is heavier, a mole of iodine atoms contains more particles than a mole of bromine atoms is false because, irrespective of difference in their masses, a mole of all substances contain the same number of particles- 6.02 * 10²³.

7. The balanced chemical equation of the reaction of sulfuric acid with hematite (Fe2O3) to produce iron (III) sulfate and water is as follows: .

Fe₂O₃ + 3H₂SO₄ > Fe₂(SO₄)₃ + 3H2O

The correct option is (A) 3H₂SO₄

8. Mass of natural gas = 1.14 * 10¹¹ Kg.

Mass of natural gas in grams = 1.14 * 10¹¹ * 10³ g = 1.14 * 10¹⁴ g

Molar mass of CH₄ = 16g/mol

Number of moles of CH₄ in 1.14 * 10¹⁴ g = 1.14 * 10¹⁴ g/ 16 gmol⁻¹ = 7.125 * 10¹² moles

1 mole of CH₄ contains 4 moles of hydrogen atoms.

7.125 * 10¹² moles of CH₄ will contain 4 * 7.125 * 10¹² moles of hydrogen atoms = 2.85 * 10¹³ moles of hydrogen atoms

1 mole of hydrogen atoms contain 6.02 * 10²³ atoms of hydrogen

2.85 * 10¹³ moles of hydrogen atoms will  contain 2.85 * 10¹³ * 6.02 * 10²³ atoms of hydrogen = 1.71 * 10³⁷ atoms of hydrogen

a:

by the combination of an unlimited number of elements

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