Answer
a. 329.4 g/mol
b. 498.4 g/mol
c. 60.09 g/mol
d. 331.4 g/mol
Work Step by Step
a. ( 1.008 $\times$ 20 )+ ( 12.01 $\times$ 19 )+ ( 14.01 $\times$ 1 )+ ( 16.00 $\times$ 3 )+ ( 19.00 $\times$ 1 )= 329.4 g/mol
b. ( 40.08 $\times$ 3 )+ ( 1.008 $\times$ 10 )+ ( 12.01 $\times$ 12 )+ ( 16.0 $\times$ 14 )= 498.4 g/mol
c. ( 1.008 $\times$ 8 )+ ( 12.01 $\times$ 3 )+ ( 16.00 $\times$ 1 )= 60.09 g/mol
d. ( 1.008 $\times$ 18 )+ ( 12.011 $\times$ 17 )+ ( 14.01 $\times$ 3 )+ ( 16.00 $\times$ 3 )+ ( 19.00 $\times$ 1 )= 331.4 g/mol