Q45 of 203 Page 129

Calculate the molecular masses of the following compounds:

(a) Methanol, CH3 OH


(b) Ethanol, C2 H5 OH

(a) Molecular mass of Methanol (CH3OH) = 1 x C + 3xH + 1xO +1xH = (12+3+16+1)u = 32u

(b) Molecular mass of Ethanol (C2H5OH) = 2xC + 5xH + 1xO + 1xH = (24 + 5 + 16 + 1) = 46u


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43

Calculate the molecular masses of the following:

(a) Hydrogen, H2


(b) Oxygen, O2


(c) Chlorine, Cl2


(d) Ammonia, NH3


(e) Carbon dioxide, CO2


(Atomic masses: H = 1 u; O = 16 u; Cl = 35.5 u; N = 14 u; C = 12 u)

 44

Calculate the molecular masses of the following compounds:

(a) Methane, CH4


(b) Ethane, C2 H6


(c) Ethene, C2 H4


(d) Ethyne, C2 H2


(Atomic masses: C = 12 u; H = 1 u)

 46

Calculate the molecular mass of ethanoic acid, CH3 COOH.

(Atomic masses: C = 12 u; H = 1 u; O = 16 u)

 47

Calculate the molecular mass of nitric acid, HNO3. (Atomic masses: H = 1 u; N = 14 u; O = 16 u)