Q50 of 203 Page 129

Calculate the molecular masses of the following compounds:

(a) Hydrogen sulphide, H2S


(b) Carbon disulphide, CS2

(a) Molecular mass of hydrogen sulphide (H2S) = 2xH + 1xS = (2+32)u = 34u

(b) Molecular mass of Carbon disulphide (CS2) = 1xC + 2xS = (12+2 x 32)u = 76 u


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Calculate the molecular mass of hydrogen bromide (HBr). (Atomic masses: H = 1 u; Br = 80 u)

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State the law of conservation of mass. Give one example to illustrate this law.

 52

State the law of constant proportions. Give one example to illustrate this law.