12.1 COUNTING PARTICLES OF MATTER PRACTICE PROBLEMS

1. Calculate the formula or molecular mass of each of the following compounds.

a. H2SO4

b. NaOH

c. NH4NO3

d. Fe(CH3COO)3

e. C3H5N3O3, nitroglycerin

f. Al(NO3)3

g. C63H84N14O14PCo, vitamin B12

h. SO2

2. Aspirin can be used to decrease pain and fever. Calculate the molecular mass of 2-acetyloxybenzoic acid (aspirin) that has the following structural formula.

3. Calculate the mass in grams of 0.354 mol of each of the following.

a. ammonia gas, NH3

b. platinum metal, Pt

c. cholesterol, C27H46O

d. iron(II) ferricyanide, Fe3(Fe(CN)6)2

4. Calculate the number of moles in 50.0 g of each of the following.

a. borazon, BN

b. thallium(I) sulfate, Tl2SO4

c. calcium propanoate, Ca(C3H5O2)2

d. penicillin G, C16H18N2O4S

5. Calculate the number of atoms, molecules, or ions for each of the following.

a. 2.00 mol Na atoms

b. 46.0 g Na atoms

c. 3.00 mol K⁺

d. 68.0 g H2S molecules

6. Calculate the mass in grams of each of the following.

a. 6.02 X 10²³ atoms of Na

b. 3.01 X 10²³ formula units of Sr(OH)2

c. 1.20 X 10²⁴ molecules of CO2

d. 1.50 X 10²³ ions of Na⁺

SECTION REVIEW

1. Calculate the formula (or molecular) mass of the following compounds:

a. K3AsO4

b. Na2B4O7

c. MnCl2

d. Al2(SO4)3

e. N2O5

f. (NH4)3PO4

g. Na2CO3

h. CHCl2COOH

i. NaCl

2. Hydrocarbons and various oxides of nitrogen react photochemically (a chemical process that requires light) to form a variety of pollutants. The formula of one of the pollutants, peroxyacetylnitrate, is

What is the molecular mass of this compound?

3. An amino acid that cannot be made (synthesized) by the body and must be obtained in the diet is lysine. Determine the molecular mass of lysine, which has the following formula.

4. Calculate the mass in grams of each of the following.

a. 6.38 mol O2

b. 4.00 mol Al

c. 2.25 mol H2SO4

d. 5.49 mol KI

e. 1.500 mol Ba(IO4)2

f. 0.602 mol Ca(NO3)2

5. Calculate the number of moles in each of the following.

a. 188.0 g Zn

b. 160.0 g Br2

c. 293.0 g Fe

d. 32.0 g SO2

e. 10.0 g Na2S

f. 84.2 g K2SO4

6. Calculate the number of atoms, molecules, or ions in each of the following

quantities.

a. 20.0 g Ca atoms

b. 3.34 mol CO2 molecules

c. 68.0 g H2S molecules

d. 0.125 mol Mg²⁺ ions

7. Calculate the mass in grams of each of the following.

a. 3.01 X 10²³ atoms of S

b. 2.41 X 10²⁴ molecules of H2O