Answer
a. 151.91 g/mol
b. 102.0 g/mol
c. 183.18 g/mol
d. 96.09 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 every element in this compound.
a. ( 55.85 $\times$ 1 )+ ( 16.0 $\times$ 4 )+ ( 32.06 $\times$ 1 )= 151.91 g/mol
b. ( 27.0 $\times$ 2 )+ ( 16.0 $\times$ 3 )= 102.0 g/mol
c. ( 1.008 $\times$ 5 )+ ( 12.01 $\times$ 7 )+ ( 14.01 $\times$ 1 )+ ( 16.0 $\times$ 3 )+ ( 32.06 $\times$ 1 )= 183.18 g/mol
d. ( 1.008 $\times$ 8 )+ ( 12.01 $\times$ 1 )+ ( 14.01 $\times$ 2 )+ ( 16.0 $\times$ 3 )= 96.09 g/mol