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Q.

A sample of O2 gas is collected over water at 23°C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23°C is 21 mm Hg). The partial pressure of O2 gas in the sample collected is

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a

21 mm Hg

b

751 mm Hg

c

0.96 atm

d

1.02 atm

answer is C.

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Detailed Solution

Pressure of O2(dry)=751−21=730mmHg=730760=0.96atm
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A sample of O2 gas is collected over water at 23°C at a barometric pressure of 751 mm Hg (vapour pressure of water at 23°C is 21 mm Hg). The partial pressure of O2 gas in the sample collected is