Question

A closed vessel contains 8 g of oxygen and 7g of Nitrogen. Total pressure at a certain temperature is 10 atm. When all the oxygen is
removed from the system without change in temperature then the pressure will be

Moderate

Solution

$PV = \frac{m}{M} RT, P \propto \frac{m}{M}$
$\frac{P_{1}}{P_{2}} = \frac{m_{1}}{m_{2}} \times \frac{M_{2}}{M_{1}}, (P_{1} + P_{1}^{1}) = 10, P_{1} = 5$

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