15. Three gases are mixed in a cylinder. The total pressure in the cylinder is 456 mmHg. If
the hydrogen gas has a pressure of 230 mmHg, and the oxygen gas has a pressure of
148 mmHg, what is the pressure of the third gas, nitrogen?

78 mmHg is the partial pressure of the nitrogen.

Explanation:

According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.

where,

= total pressure of the gas mixture = 456 mmHg

= partial pressure of hydrogen gas = 230 mmHg

= partial pressure of oxygen gas = 148 mmHg

= partial pressure of nitrogen gas = ?

Now put all the given values is expression, we get the partial pressure of the nitrogen gas i.e.   .

78 mmHg is the partial pressure of the nitrogen.

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