Homework Help: chemistry

Posted by Holly on Wednesday, November 2, 2011 at 4:36pm.

A sample of O2 gas is collected over water at 23C at a barometric pressure of 751 mmHg (vapor pressure of water at 23C is 21 mmHg). The partial pressure of O2 gas in the sample collected is:
(a) 21 mmHg
(b) 751 mm Hg
(c) 0.96 atm; or
(d) 1.02 atm
The answer is (c). Not sure how the problem is worked out. thank you.

chemistry - Holly, Wednesday, November 2, 2011 at 6:03pm
I figured it out. P total=751 mmHg. Partial pressure O2 + partial pressure H2O=751 mmHg. partial pressure O2=730 mmHg and 1atm/760 mmHg=x atm/730 mmHg. answer=0.96 atm! It was so easy I missed it....

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