Calculate the molecular masses of the following compounds:

(a) Hydrogen sulphide, $H_{2} S$
(b) Carbon disulphide, $C S_{2}$

(Atomic masses: H = 1u , S = 32u, C = 12u)

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Solution

(a) Molecular mass of hydrogen sulphide, $(H_{2} S) = (2 \times 1) + (1 \times 32) = (2 + 32) u = 34 u$

(b) Molecular mass of carbon disulphide, $(C S_{2}) = (1 \times 12) + (2 \times 32) = (12 + 64) u = 76 u$

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