Chemistry

A sample of nitrogen gas is collected overwater at a temperature of 23◦C. What is the pressure of the nitrogen gas if the atmospheric pressure is 744 mmHg?
Answer in units of mmHg.

Not sure of formula for this

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  1. A gas 'collected over water' is a mixture of water vapor and the gas. So
    P,total = P,gas + P,water vapor

    You'll solve for P,gas and to do that, you'll need data for vapor pressure of water at 23 C.
    P,water vapor = 21.1 mm Hg (different sources may show different values)

    Substitute:
    744 = P,gas + 21.1
    P,gas = ?

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  2. I guess I am I don't get it

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  3. What don't you get? Dalton's law of partial pressures tells us that the total pressure of a system is the sum of the partial pressures of each gas. You have two gases in this system; i.e., N2 gas and water (as a vapor which is a gas). So according to Dalton's Law, the total pressure, which is given in the problem as 744 mm, is the total of the two pressures.
    Ptotal = pH2O + pN2
    Ptotal = 744 (from the problem)
    pH2O = 21.1 (from a table)
    pN2 = ?

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