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March 27, 2017

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A sample of hydrogen gas was collected over water at 36°C and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (Vapor pressure of water is 44.6 torr at 36°C)

  • chemistry - ,

    Use PV = nRT
    For P: The total P of the system is the pressure of the gas + pressure of water vapor.
    Pgas alone = total P - vapor pressure H2O
    P gas = 855 - 44.6 = ??
    Now convert P in mm to P in atmospheres.
    P mm/760 = P atm.
    V is in liters.
    Don't forget to convert T to Kelvin.
    Solve for n.

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