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Question

# Find the partial pressure of carbon dioxide in a gas mixture with a total pressure of 30.4 kPa if the partial pressures of the other two gases in the mixture are 16.5 kPa and 3.7 kPa.

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$_{Carbon-dioxide}$ + P$_{gas1}$ + P$_{gas2}$

Given P$_{total}$ = 30.4 $\mathrm{kPa}$, P$_{gas1}$ = 16.5 $\mathrm{kPa}$ and P$_{gas2}$ = 3.7 $\mathrm{kPa}$, therefore P$_{Carbon-dioxide}$ = 30.4 - 16.5 - 3.7 = 10.2 $\mathrm{kPa}$

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