In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is [2019]

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Solution

Q.
In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is [2019]

1 1.18 atm

2 1.76 atm

3 1.176 atm

4 0.98 atm

Ans.
(3)

$p_{water vapour} = x_{water vapour} \times P_{total}$

$= 0.02 \times 1.2 = 0.024$ $atm$

$P_{total} = p_{water vapour} + p_{dry air}$

$1.2 = 0.024 + p_{dry air}$

$p_{dry air} = 1.2 - 0.024 = 1.176$ $atm$

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