Answer
a. 32.00 g/mol
b. 136.09 g/mol
c. 354.20 g/mol
d. 120.10 g/mol
Work Step by Step
1. Consult a periodic table in order to get the atomic mass of each element, and then multiply it by its subscript.
2. Sum the masses of each element in the compound.
a. ( 16.00 $\times$ 2 )= 32.00 g/mol
b. ( 1.008 $\times$ 2 )+ ( 16.0 $\times$ 4 )+ ( 30.974 $\times$ 1 )+ ( 39.098 $\times$ 1 )= 136.09 g/mol
c. ( 35.45 $\times$ 3 )+ ( 55.85 $\times$ 1 )+ ( 16.00 $\times$ 12 )= 354.20 g/mol
d. ( 1.008 $\times$ 8 )+ ( 12.01 $\times$ 4 )+ ( 16.0 $\times$ 4 )= 120.10 g/mol