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ICSE Class 10 Chemistry Question 10 of 72

Mole Concept & Stoichiometry Miscellaneous Exercises — Question 10

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Question

Question 10

A gas cylinder filled with hydrogen holds 5 g of the gas. The same cylinder holds 85 g of gas X under the same temperature and pressure. Calculate:

(a) Vapour density of gas X.

(b) Molecular weight of gas X.

Answer

(a ) V.D. = mass of certain volume of gas at S.T.P.mass of equal volume of H2 at S.T.P.\dfrac{\text{mass of certain volume of gas at S.T.P.}}{\text{mass of equal volume of H}_2\text{ at S.T.P.}} = 855\dfrac{85}{5} = 17

(b) Molecular weight = 2 x V.D. = 2 x 17 = 34 a.m.u.