1. pg 335 34. Determine the molar mass of each ionic compound. NaOH CaCl2
KC2H3O2 c) a)
22.99g Na 1 mol Na
39.10g K 1 mol K
1 mol Na*
=22.99g Na
1 mol K*
= 39.10g K
16.00g O
1 mol O
2 mol C*
12.01g C 1 mol C
1 mol O*
=16.00g O
= C
1.008g H 1 mol H
1 mol H*
=1.008g H
1.008g H 1 mol H
3 mol H*
= 3.024g H
Molar mass=40.08 g/mol b)
40.08g Ca 1 mol Ca
= g Ca
16.00g O 1 mol O
1 mol Ca*
2 mol O*
= O
35.45g Cl 1 mol Cl
Molar mass= g/mol
2 mol Cl*
=70.90 g Cl
Molar mass= g/mol

2. pg 335 35. Calculate the molar mass of each molecular compound. C2H5OH
HCN
CCl4
a) 2 𝑚𝑜𝑙 𝐶 𝑥 𝑔 𝐶 1 𝑚𝑜𝑙 𝐶
6 𝑚𝑜𝑙 𝐻 𝑥 𝑔 𝐻 1 𝑚𝑜𝑙 𝐻
1 𝑚𝑜𝑙 𝑂 𝑥 𝑔 𝑂 1 𝑚𝑜𝑙 𝑂
= 24.0 g/mol b)
1.008g H 1 mol H
1 mol H*
=1.008g H
= 6.0 g/mol
12.01g C 1 mol C
1 mol C*
= 12.01g C
= 16.0 g/mol
14.01g N 1 mol N
1 mol N*
= 14.01g
Molar mass = 46.0 g/mol c)
12.01g C 1 mol C
1 mol*
=12.01 g C
Molar mass HCl=27.03 g/mol
35.45g Cl 1 mol Cl
4 mol Cl*
= g Cl
Molar mass CCl4= g/mol

3. pg 336
37. The United States chemical industry produces more sulfuric acid (H2SO4), in terms of mass, than any other chemical. What is the mass of 3.25 mol of H2SO4
2 𝑚𝑜𝑙 𝐻 𝑥 𝑔 𝐻 1 𝑚𝑜𝑙 𝐻
1 𝑚𝑜𝑙 𝑆 𝑥 𝑔 𝑆 1 𝑚𝑜𝑙 𝑆
4 𝑚𝑜𝑙 𝑂 𝑥 𝑔 𝑂 1 𝑚𝑜𝑙 𝑂
=2.016 𝑔 𝐻
=32.07 𝑔 𝑆
=64.00 𝑔 𝑂
𝑚𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 𝐻 2 𝑆 𝑂 4 =98.09 𝑔/𝑚𝑜𝑙
3.25 𝑚𝑜𝑙 𝐻 2 𝑆 𝑂 4 𝑥 𝑔 𝐻 2 𝑆 𝑂 4 1 𝑚𝑜𝑙 𝐻 2 𝑆 𝑂 4
=𝟑𝟏𝟗 𝒈 𝐻 2 𝑆 𝑂 4

4. pg 336
38. What is the mass of 4.35*10^-2 mol of zinc chloride (ZnCl2).
1 𝑚𝑜𝑙 𝑍𝑛 𝑥 𝑔 𝑍𝑛 1 𝑚𝑜𝑙 𝑍𝑛
2 𝑚𝑜𝑙 𝐶𝑙 𝑥 𝑔 𝐶𝑙 1 𝑚𝑜𝑙 𝐶𝑙
=65.38 𝑔 𝑍𝑛
=70.90 𝑔 𝐶𝑙
𝑚𝑜𝑙𝑎𝑟 𝑚𝑎𝑠𝑠 𝑍𝑛𝐶 𝑙 2 = 𝑔/𝑚𝑜𝑙
4.35 𝑥 10 −2 𝑚𝑜𝑙 𝑍𝑛𝐶 𝑙 2 𝑥 𝑔 1 𝑚𝑜𝑙 𝑍𝑛𝐶 𝑙 = 5.93 g 𝑍𝑛𝐶 𝑙 2

5. pg 337 40. Determine the number of moles present in each compound.
22.6 g AgNO3 1 mole
169.9 g AgNO3
6.50 g ZnSO4 1 mole
161.5 g ZnSO4
35.0 g HCl 1 mole
36.5 g HCl
= mol
= mol
= mol

6. pg 339
42. Ethanol (C2H5OH), a domestically produced fuel source, is often blended with gasoline. A sample of ethanol has a mass of 45.6g.
How many carbon atoms does the sample contain?
How many hydrogen atoms are present?
How many oxygen atoms are present
45.6 g
1 mol
46.07 g
= .990 mol
6.02*10^ mol
x 2 atoms C = 1.19*1024 C atoms
1 molecule C2H5OH
x 6 atoms C = 3.59*1024 H atoms
c) x 1 atom O = 5.96*1023 O atoms

7. pg 339 2.25 g Na2SO3 x 1 mol = 0.0178 mol 126.1 g 2.15*1022 Na+ ions
43. A sample of sodium sulfite (Na2SO3) has a mass of 2.25g.
How many Na+ ions are present?
How many SO3(2-) ions are present?
What is the mass in grams of one formula unit of Na2So3
2.25 g Na2SO3 x 1 mol = mol
126.1 g
2.15*1022 Na+ ions
1.07*1022 So3 (2-) ions
2.09 * g Na2So3/ formula unit

8. pg 339 52.0 g CO2 x 1 mol = 1.18 mol 44.0 g x NA = 7.11*1023 C atoms
44. A sample of carbon dioxide (CO2) has a mas of 52.0g.
How many carbon atoms are present?
How many oxygen atoms are present?
What is the mass in grams of one molecule of CO2?
52.0 g CO2 x 1 mol = mol
44.0 g
x NA = 7.11*1023 C atoms
x NA x 2 = 1.42*1024 O atoms
44.0 / NA = 7.31*10-23 g CO2/ molecule