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March 25, 2017

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Is there an easy way to re-write PV=nRT so that it equates density with molar mass?

  • Chem - ,

    Yes. I'll show you how to do it. I never remember the formula but I know how to get it if I need it.
    PV = nRT
    n = moles = grams/molar mass; substitute.
    PV = (g/M)RT where M is molar mass.
    Rearrange to PVM = gRT.
    Density = g/v (in liters).
    PM = (g/V)RT
    PM = dRT where d is density. You must remember density is in g/L and not g/mL as is so often quoted.

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