First slide

Gaseous state

Question

To an evacuated vessel with movable piston, under external pressure of 1 atm, 0.1 mole of He and 1.0 mole of an unknown compound (vapour pressure 0.68 atm. at 0° C) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0°C is close to the nearest integer

Moderate

Solution

For any ideal gas, PV = nRT
For He, n = 0.1, P = 0.32 atm., V = ?,T = 273
$0 .32 \times V = 0 .1 \times 0 .0821 \times 273$
V = 7L
(unknown compound X will not follow ideal gas equation)

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