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Question

A mixture of helium and argon contains 3 moles of He for every 2 moles of Ar. The partial pressure of argon in the mixture is

A
two thirds the total pressure
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B
one third the total pressure
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C
three fifths the total pressure
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D
two fifths the total pressure
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Solution

The correct option is D two fifths the total pressure
The partial pressure of any gas is the product of mole fraction and total pressure

PAr=22+3.Ptotal

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