Question

Pressure in a mixture of $4g$ of $O_2$ and $2g$ of $H_2$ confined in a bulb of 1 litre at $0^{\circ }C$ is

• A. 45.215 atm
• B. 31.205 atm
• C. 25.215 atm
• D. 15.210 atm

Answer 1

Answer: (C)

Moles of oxygen, $n_{O_2}=\frac{4}{32}=0.125mol$

Moes of hydrogen, $n_{H_2}=\frac{2}{2}=1.00mol$

Temperature $=273K$, volume $=1$ litre

$\Rightarrow$ Total pressure $=\frac{\left(n_{O_2}+n_{H_2}\right)\times RT}{V}$

$=\frac{1.125\times 0.0821\times 273}{1}$

$=25.215$ atm