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On a humid day in summer, the mole fract...

On a humid day in summer, the mole fraction of gaseous `H_(2)O` (water vapour) in the air at `25^(@)C` 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

B

0.949 atm

C

949 atm

D

0.648 atm

Text Solution

Verified by Experts

The correct Answer is:
B
`P_(H_(2)O)=X_(H_(2)O)P_("total")`
`" "=0.0287 times 0.977`
`" "=0.028 atm`
`" "P_("total")=P_("dry air")+P_(H_(2)O)`
`" "P_("dry air")=P_("total")-P_(H_(2)O)`
`" "=0.977-0.028=0.949 atm`
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