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A certain vessel X has water and nitroge...

A certain vessel `X` has water and nitrogen gas at a total pressure of 2 atm and `300 K`. All the contents of vessel and transferred to another vessel `Y` having half the capacity of the vessel `X`. The pressure of `N_(2)` in this vessel was 3.8 atm at `300 K`. The vessel `Y` is heated to `320 K` and the total pressure observed was 4.32 atm. Assume that the volume occupied by the gases in vessel is equal to the volume of the vessel. Calculate the following:
Enthalpy of vapourization.

A

`30.00`

B

`35.65`

C

`38.65`

D

`39.65`

Text Solution

Verified by Experts

The correct Answer is:
D
Enthalpy of vapourization `(Delta_(vap)H)`
`rArr log p_(1)/p_(2)=(DeltaH)/(2.303 R)[1/300 - 1/320]`
`rArr log 0.27/0.10=(DeltaH)/(2.303 R)[1/300-1/320]`
= `Delta_(vap)H=39.65 KJ "mol"^(-1)`
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