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March 28, 2017

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60.0 mL of O2 was collected over water at a total pressure of 755 torr and a temp of 25C. The vapor pressure of water at 25C is 24 torr. How many moles of O2 were collected?

Could you please explain and show the steps? I know the answer is 2.36x10^-3.

  • Chemistry - ,

    Ptotal = pO2 + pH2O
    755 torr = pO2 + 24
    pO2 = 755-24 = 731 torr
    P in atm = 731/760 = ?
    V = 0.060L
    T = 298 K
    R = 0.08206 L*atm/mol*K
    Use PV = nRT and solve for n.

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