Question

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 O 2 gas in the sample collected is
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Answer 1

Answer:

Using the Dalton's law  

P (Total)  = Poxygen +Pwater  

The vapor pressure of water is 21mmHg

751mmHg = Poxygen + 21 mmHg

Poxygen = 751 mmHg - 21 mmHg

Poxygen =730 mmHg

Convert the partial pressure of oxygen in to atmosphere

(730 mmHg) (1 atm / 760 mmHg) = 0.96 atm