Question

Pressure in a mixture of $4 \,g$ of $O _{2}$ and $2\, g$ 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)

25.215 atm

Answer 2

Moles of oxygen, $n_{O_{2}}=\frac{4}{32}=0.125\, mol$ Moes of hydrogen, $n_{H_{2}}=\frac{2}{2}=1.00 \,mol$ Temperature $=273\, K$, volume $=1$ litre $\Rightarrow$ Total pressure $=\frac{\left(n_{O_{2}}+n_{H_{2}}\right) \times R T}{V}$ $=\frac{1.125 \times 0.0821 \times 273}{1}$ $=25.215$ atm