Question

The pressure of fixed mass of gas is 960 mm Hg when the volume of the is 3.0 m^3. Find the pressure of the gas when its volume is 4.5 m^3 l. Assume that the pressure is constant.

Answer 1

Apply the ideal gas law assuming the temperature is constant, not pressure:

$$V_1P_1=V_2P_2,\\\space\\ P_2=P_1V_1/V_2=640\text{ mm Hg}.$$