Question

3g of $H_2$ and 24g of $O_2$ are present in a gaseous mixture at constant temperature and pressure. Find the partial pressure of hydrogen.

• A. $\frac{1}{3}$ of total pressure
• B. $\frac{2}{3}$ of total pressure
• C. $\frac{3}{2}$ of total pressure
• D. $\frac{1}{2}$ of total pressure

Answer 1

The correct option is B

$\frac{2}{3}$ of total pressure

$P_{H_2}=\frac{n_{H_2}}{n_{H_2}+n_{O_2}}\times P_T$

$\Rightarrow \frac{\frac{3}{2}}{\frac{3}{2}+\frac{24}{32}}\times P_T$

$\Rightarrow \frac{1.5}{1.5+0.75}{P}_T$

$\Rightarrow \frac{1.5}{2.25}{P}_T$

$\Rightarrow \frac{2}{3}{P}_T$