a) 63,5 + 32 + 4 × 16 + 5 × 18 = 249,5 g/mol
b) 56 + 32 + 4 × 16 + 7 × 18 = 278 g/mol
c) 40 + 2 × 35,5 + 6 × 18 = 219 g/mol
d) 2 × 23 + 32 + 4 × 16 + 10 × 18 = 322 g/mol
