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Question

A mixture of non reacting gases exert a pressure of 5 atm. If one of the gases occupy 40% volume of the mixture, what would be its partial pressure in atm?

Solution
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Volume percent can be approximated to mole percent as volume is directly proportional to the number of moles.
Volume percent of the gas =40 %
Mole percent of the gas =40 %
Mole fraction of the gas =40100=0.4
The partial pressure of a gas is the product of its mole fraction and total pressure. It is
=0.4×5atm=2atm.
Hence, the partial pressure of the gas is 2 atm.

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