Question

9. A mixture of dihydrogen and dioxygen at one bar pressure contains 2015
by weight of dihydrogen. Calculate the partial pressure of dihydrogen and
dioxygen
​

Answer 1

In 100 g of mixture, the mass of hydrogen and oxygen will be 20 and 80 g respectively.

The number of moles of hydrogen are n= 2/20

=10.

The number of moles of oxygen are n = 32/80

=2.5.

The mole fraction of hydrogen is 10+2.5/10

=0.8.

Partial pressure of hydrogen is 0.8×P=0.8×1=0.8 bar

Hope it helps...