Question

At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A is____ g mol^–1 (nearest integer) Assume that the behaviour of gases as ideal. (Given: The molar mass of hydrogen (H₂) gas is 2.0 g mol^–1 )

Answer 1

Given : Ideal gas A and H2 gas at same pressure and volume. 

From ideal gas equation pv = nRT 

n₁T₁ = n₂T₂ 

\(\frac{3}{GMM \,of\,A}\times300\) = 0.2/2 x 200 

GMM of A = 45 g/mole