The pressure of He gas, P = 0.95 atm
Temperature, T = 303 K
Gas constant, R = 0.0821 L.atm.K⁻¹mol⁻¹
Number of moles of He gas, n = 0.103 mol
According to an ideal gas equation, PV = nRT
V = nRT/P
= (0.103 mol) (0.0821 L.atm.K⁻¹mol⁻¹) (303 K) / 0.95 atm
= 2.7 L
Thus, the volume of the He gas is 2.7 L.
