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Choose the correct option for the total pressure (in atm.) in a mixture of 4 g $O_2$ and 2 g $H_2$ confined in a total volume of one litre at $0^\circ C$ is: [Given $R=0.082\ L\ atm\ mol^{-1}K^{-1}$, $T=273\ K$]
Detailed Solution
$n_{O_2} = \frac{4}{32} = \frac{1}{8}$ mol ; $n_{H_2} = \frac{2}{2} = 1$ mol ; $n_{total} = \frac{9}{8}$ mol
$PV = nRT \Rightarrow P \times 1 = \frac{9}{8} \times 0.082 \times 273$
$P_{total} = 25.18$ atm