Question

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 wii be :

• A. P
• B. 2P
• C. P/2
• D. P${}^2$

Answer 1

Answer: (C)

P/2

As we know, the ideal gas equation is $PV = nRT$

Now since N2 is removed the total pressure would be equal to the partial pressure exerted by the O2 gas and vice versa. Therefore, the pressure after the N2 of any gas would be equal to P/2 mm of Hg.

So, the correct option is $C$.