Answers to HW Chapter 7
Section review page 215 and end of chapter p.237: 30 a and b, 31 a and b; 32 b; 33c; 34, 36, 37 and 38

1. It indicates the types and numbers of atoms or ions present in a formulas
unit or molecule of a compound

2. a. AlBr3
b. Na2O
c. MgI2
d. PbO
e. SnI2
f. Fe2S3
g. Cu(NO3)2
h. (NH4)2SO4

3. a. Sodium iodide
b. magnesium sulfide
c. calcium oxide
d. potassium sulfide
e. copper(I)bromide
f. Iron (II) chloride

4. a. BaS
b. NaOH
c. Pb(NO3)2
d. KMnO4
e. FeSO4
f. P2O3
g. S2Cl2
h. CSe2
i. CH3COOH
j. HClO3
k. H2SO3
l. H3PO4

p.237:
30 a 1 mol K+ and 1 mol NO3 -1
30 b2 mol Na+ and 3 mol O
31 a 101.11 g/mol
31 b142.05 g/mol
32 b2.752 mol Ba(OH)2
33c 41.67 % Mg, 54.87 % O, 3.46 % H

34, 36.08%
36, C2H6O
37 NaNO3
38 C6H8O7