First slide

Gaseous state

Question

Mole fraction of water vapour in the water saturated air is 0.02. If total pressure is 1 .2 atm, partial pressure of dry air is

Moderate

A

1.18 arm
B

1.22 atm
C

1.176 arm
D

1.224 atm

Solution

$χ (dry air) = 1 - 0 .02 = 0 .98 atm ∴ Partial pressure (dry air) = 0 .98 \times 1 .2 = 1 .176$

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