Water

18.015:0.622 = 28.96

Alcohols

Methanol

32.042:1.12 = 28.61

Ethanol

46.048:1.6 = 28.79

Propanol

60.95:2.1 = 28.62

Butanol

74.121:2.6 = 28.51

Pentanol

88.148:3.05 = 28.91