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Dalton's Law of Partial Pressures

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Question

Calculate the total pressure in a mixture of $4 g$ of oxygen and $3 g$ of hydrogen confined in a total volume of one litre at $0^{\circ} C$ .

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Solution

Total moles = $\frac{4}{32} + \frac{3}{2} = \frac{13}{8}$
$P = \frac{n_{t o t a l} R T}{V}$
= $\frac{13 \times 0.0821 \times 273}{8 \times 1} = 36.42 a t m$

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