posted by Peter

A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas?


  1. DrBob222

    Use PV = nRT
    Calcualte n
    n= #moles = grams/molar mass
    You know n and g, calculate molar mass

  2. Peter

    How do I know what N is??

  3. DrBob222

    n comes from the equation PV = nRT.
    You have V, P, T, and you know R (0.08206) . n is the only unknown in that equation.
    Don't forget to change T to Kelvin.
    K = 273 + Celsius.

  4. James


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