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Question

200 ml of He at 0.66 atm pressure and 400 ml of O2 at 0.52 atm pressure are mixed in a 400 ml vessel at 25C. The partial pressure of He and O2 will be:

A
0.33 and 0.56
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B
0.33 and 0.52
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C
0.38 and 0.56
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D
0.25 and 0.45
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Solution

The correct option is C 0.33 and 0.52
Partial pressure is the pressure of individual gas when it is placed in a required vessel or in final vessel.

Given :- Initially volume of He is 200 ml at 0.66 atm after placing it in a vessel of volume 400 ml

P1V1=P2V2

.66×200=P2×400

P2=0.33 atm ----------- (Partial pressure of He)

Initially O2 is present at 0.25 atm in 400 ml volume and then it is placed in 400 ml vessel hence the partial pressure of O2 is 0.52 atm

Partial pressure of He=0.33 atm
Partial pressure of O2=0.52 atm

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