Question

Mole fraction of H2 in a 2g mixture of H2 and He is 0.5. Thus He present in the mixture Is

Answer 1

1gm or 0.25 mole of he

Explanation:

by law of conservation of mass,

mass of reactants is equal to mass of products.

1 mole of H2 = 2 gm

or, 0.5 mole of H2 =1gm

therefore He has to be 1 gm

4 gm of He =1mole

or, 1 gm of He = 0.25 mole