Question

A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.

Answer 1

Pressure of the gasoline mixture = 1 bar

Let us examine the 100g of the mix.

So, the volume of hydrogen in the compound  = 20 g

& quantity of oxygen in the mix = 80 g

Using the corresponding molar volumes, we perceive

 nH = 20/ 2  = 10 mol

. nO = 80 / 32 = 2.5 mol

Then, pH = XH x Ptotal

= (nH / nH + nO) x P total  

= (10 / 10 + 2.5 ) x  1  

= 0.8 bar

Hence, the undue pressure of dihydrogen is 0.8 bar.