Question

6. Sulfur dioxide from coal-fired power plants combines with water in the atmosphere to produce acid rain. What is the product when one molecule of SO2 reacts with one molecule of water? A. two molecules of sulfurous acid D. one molecule of sulfuric acid B. one sulfate ion E. one molecule of sulfurous acid C. two sulfite ions 7. Identify the correct statement regarding the mole. A. A mole of oxygen gas contains 6.02 x 10 atoms B. A mole of chlorine gas contains 2 x 6.02 x 103 molecules. C. A mole of carbon dioxide contains two moles of oxygen atoms D. A mole of ammonia gas (NH3) has a mass of 34.0 g. E. A mole consists of the number of particles in exactly 12 g of naturally occurring carbon 8. Which of the following contains the largest number of atoms? A. 1 mol water B. 1 mol phosphorus trichloride C. 1 mol dinitrogen pentoxide D. 2 mol carbon monoxide E. All of these contain the same number of atoms 9. When are an empirical formula and a molecular formula the same? A. always B. when the mass of the empirical formula unit is equal to the molecular mass C. when the mass percentages of all of the elements in the two formulas are the same D. never E. when the molecular mass is an integer multiple of formula unit mass 10. Which of the following does NOT share the same empirical formula as the others? D. butyric acid, CH;CH2CH2COOH A. formaldehyde, CH20 E. glucose, C&H12O B. acetic acid, CH3COOH C. lactic acid, CH3CH(OH)COOH 11.A hydrocarbon molecule contains twice as many hydrogen atoms as carbon atoms. Its molar mass is 84.15 g/mol. What is the molecular formula for the hydrocarbon? D. CsH16 A. CH4 E. CH2 B. CoH12 C. C$H10

Answer 1

6)

The reaction is:

SO2 + H2O -> H2SO3

The product is one molecule of H2SO3 which is sulphurous acid

Answer: E

7)

A)

One mol of O2 has 6.02*10^23 molecules of O2

Number of atoms = 2*6.02*10^23

B)

1 mol of Cl2 has 6.02*10^23 molecules of Cl2

C)

1 mol of CO2 has 1 mol of C and 2 moles of O

This is correct

D)

Molar mass of NH3 = 14 + 3*1 = 17 g/mol

So, mass of 1 mol of NH3 is 17.0 g

E)

Its not natural occurring Carbon.

1 mol consists of the number of particle in exactly 12 g of C-12

Answer: C

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