4(i)
A gas cylinder can hold 150 g of hydrogen under certain conditions of temperature and pressure. If an identical cylinder with the same capacity can hold 450 g of gas ‘G’ under the same conditions of temperature and pressure, find:
(a) the vapour density of the gas ‘G’.
(b) the molecular weight of gas ‘G’.
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(a ) V.D. = $\frac{\text{mass of certain vol. of gas under similar conditions}}{\text{mass of equal vol. of H}_2\text{ under similar conditions}}$ = $\frac{450}{150}$ = 3
(b) Molecular weight = 2 x V.D. = 2 x 3 = 6 a.m.u.