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The vapour pressure of water at 80^(@)C ...

The vapour pressure of water at `80^(@)`C is 355.5 mm of Hg. A 100 mL vessel contains water saturated with `O_2` at `80^(@)C`, the total pressure being 760 mm of Hg. The contents of the vessel were pumped into a 50 mL vessel at the same temperature. What is the partial pressure of `O_2`?

A

1115 mm

B

809 mm

C

405 mm

D

3555 mm

Text Solution

Verified by Experts

The correct Answer is:
B
`p_("total")=p_(H_2O) + p_(O_2)`
`p_(O_2 ) =760 - 355.5 = 404. 5 mm` .
When the contents wer pumped into 50 mL vessel
`P_1 = 404.5 , V_1 = 100 mL , P_2 = ? , V_2 = 50 mL , P_1 V_1 = P_2 V_2 `
`P_2= (404.5 xx 100)/(50) = 809 mm`
Thus , `p_(O_2)` in 50 mL vessel = 809 mm.
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