Question

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

• A. $0.8bar$
• B. $0.4bar$
• C. $1.6bar$
• D. $3.2bar$

Answer 1

The correct option is A $0.8bar$

Let the weight of total mixture = 100 g
As we know,
$P_{H_2}=P_{total}\cdot X_{H_2}\Rightarrow P_{total}\times \frac{n_{H_2}}{n_{H_2}+n_{O_2}}\Rightarrow 1\times \frac{20/2}{\frac{20}{2}+\frac{80}{32}}=0.8bar$