To an evacuated empty vessel which has a movable piston under external pressure of 1 atm, 0.20 mol of He and 1.00 mol of an unknown gas (vapour pressure = 0.70 atm at 300 K) are introduced. Assuming ideal gas behavior, the total volume of the gases at 300 K is ------ L

Answer

`16.42`

Explanation

Pressure of `He = 1 - 0.70 = 0.30` atm
`V = ( n RT)/(P) = ( 0. 20 xx 0.0821 xx 300)/(0.30) = 16. 42 L`