On a humid day in summer, the mole fraction of gaseous H_2 O (wat… - Vidyadip

MCQ

On a humid day in summer, the mole fraction of gaseous $\ce{H_2O} ($water vapour$)$ in the air at $250C$ can be as high as $0.0287.$ Assuming a total pressure of $0.977$ atm. What is the partial pressure of dry air?

A
$94.9$ atm
✓
$0.949$ atm
C
$949$ atm
D
$943$ atm

✓

Answer

Correct option: B.

$0.949$ atm

$\ce{pH_2O = XH_2O}$ ptotal
$= 0.0287 \times 0.977$
$= 0.028$ atm
ptotal $=$ pdryair $+\ \ce{pH_2O}$
pdryair $=$ ptotal $−\ \ce{pH_2O}$
$= 0.977 − 0.028$
$= 0.949$ atm

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