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Question

# What is the partial pressure of hydrogen gas in a mixture of hydrogen and helium if the total pressure is 600 mmHg and the partial pressure of helium is 439 mmHg?

Solution

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As per Dalton's law of partial pressures, total pressure is equal to summation of individual partial pressure.

Based on above statement, we can say that P$_{total}$ = P$_{helium}$ + P$_{hydrogen}$

Given P$_{total}$ = 600 $\mathrm{mm Hg}$ and P$_{helium}$ = 439 $\mathrm{mm Hg}$, therefore P$_{hydrogen}$ = 600 - 439 = 161 $\mathrm{mm Hg}$

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