Nitrogen is dissolved in water with the total pressure of gas(Nitrogen + water v

Question

Nitrogen is dissolved in water with the total pressure of gas(Nitrogen + water vapor) over the water being 1.40 atm. Thetemperature is 25o C.

What is the concentration of Nitrogen in the water?
Give your answer in g/L .

The vapor pressure of water at 25.0oC is23.8 mm Hg.

 Note that kH  has units of   mol/L--------mm Hg

Nitrogen is dissolved in water with the total pressure of gas(Nitrogen + water vapor) over the water being 1.40 atm. Thetemperature is 25o C.

What is the concentration of Nitrogen in the water?
Give your answer in g/L .

The vapor pressure of water at 25.0oC is23.8 mm Hg.

Explanation / Answer

pressure N2 = 1.40 - (23.8 / 760) = 1.37atm
.
T = 25 + 273 = 298 K
.
(n / V) = (p / RT) = 1.37 / 0.0821 x 298 = 0.05594 mol/L
.
(0.05594 x 28 g/mol) / 1L = 1.57 g/L .

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