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ICSE Class 10 Chemistry Question 13 of 23

Model Paper 2 — Question 6

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6
Question

Question 4(ii)

Calculate:
A gas cylinder is filled with hydrogen and it holds 50 g of gas. The same cylinder holds 200 g of gas X and 500 g of gas Y under same temperature and pressure conditions. Calculate the vapour density of gas X and molecular mass of gas Y.

Answer

Given,
At same temperature and pressure Mass of hydrogen = 50 g
Mass of gas X = 200 g
Mass of gas Y = 500 g

V.D. of gas X = mass of certain volume of gas X mass of equal volume of H2\dfrac{\text{mass of certain volume of gas X }}{\text{mass of equal volume of H}_2} = 20050\dfrac{200}{50} = 4

V.D. of gas Y = mass of certain volume of gas Ymass of equal volume of H2\dfrac{\text{mass of certain volume of gas Y}}{\text{mass of equal volume of H}_2} = 50050\dfrac{500}{50} = 10

Molecular weight = 2 x V.D. = 2 x 10 = 20 a.m.u.

∴ The vapour density of gas X is 4 and Molecular mass of gas Y is 20 a.m.u.