Question

a mixture of helium and methane contains 20% of helium by mass. the mole fraction of methane in the mixture is?​

Answer 1

Answer:

the answer is 1/2.

Explanation:

Let the total mass of mixture is x gram.

Then He gas present in mixture =x/5 g=x/5÷4 mole =x/20 mole

Then CH4 gas present in mixture= 4x/5 g

=4x/5÷16 mole = x/20 mole

Mole fraction=x/20÷(x/20+x/20)= 1/2

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