Question

A laboratory hydrogen generator collects the gas produced by bubbling it through water. The total pressure of the gas collected is 751 mmHg. The temperature is 34 °C, at which water vapor pressure is 40.0 mmHg. Calculate the partial pressure of the hydrogen.

Answer 1

Answer:

$711\ \text{mmHg}$

Explanation:

$P_{total}$ = Total pressure = 751 mmHg

$P_{water}$ = Vapor pressure = 40 mmHg

$P_{gas}$ = Pressure of gas

The total pressure in a system is given by Dalton's law

$P_{total}=P_{gas}+P_{water}\\\Rightarrow P_{gas}=P_{total}-P_{water}\\\Rightarrow P_{gas}=751-40\\\Rightarrow P_{gas}=711\ \text{mmHg}$

The partial pressure of the hydrogen is $711\ \text{mmHg}$