Question

The pressure of a certain mass of gas at 27${}^0$C is 84cm of Hg. If 25% of the gas is now introduced into the same vessel at the same temperature, the final pressure of the gas will be in cm of Hg

• A. 105
• B. 100
• C. 95
• D. 90

Answer 1

The correct option is A 105

Pressure=$h\rho g=\frac{nRT}{V}$

$⟹h\propto n\propto m$

Therefore $\frac{h_2}{h_1}=\frac{1.25m_0}{m_0}$

$⟹h_2=1.25h_1=105cm$