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  4. A closed vessel contains equal number of nitrogen and oxygen molecules at pressure of P mm. If nitrogen is removed from the system, then the pressure will be :

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Q. A closed vessel contains equal number of nitrogen and oxygen molecules at pressure of $P\, mm$. If nitrogen is removed from the system, then the pressure will be :

States of Matter

Solution:

$PV= nRT$
$P' V= \frac{n}{2}RT$
$\Rightarrow P'=\frac{P}{2}$