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Mole Fraction

A mixture of ...

Question

A mixture of helium and argon contains 3 moles of $H e$ for every 2 moles of $A r$ . 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

$P_{A r} = \frac{2}{2 + 3} . P_{t o t a l}$

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