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The mass of an evacuated 255-mL flask is 143.187g. The mass of the flask filled with 267 torr of an unknown gas at 25 degrees Celsius is 143.289g. Calculate the molar mass of the unknown gas.

  • CHEM -

    Use PV=nRT

    This will give you the number of moles. 143.289-143.187 = 0.102 is the mass of n moles so 0.102/n is the molar mass or mass of one mole.

  • CHEM -

    27.8

  • CHEM -

    53562

  • CHEM -

    27.8 is right!

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