Chemistry, HELP!!

a) If the volume of a flask is 165 mL and the mass of the vapor in the flask is 0.2136 grams, what is the density of vapor in the flask?

b)If the temperature of the vapor is 25 degrees Celsius, what is the molecular weight of the vapor? (Assume the gas pressure to be 1.00 atm.)

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  1. a.
    density = mass vapor in grams/volume in mL

    b.
    I would use the modified ideal gas formula of PM = dRT where P is pressure in atm, M is molar mass, d is density in g/L (note, not g/mL), R is 0.08205 and T is 298K.

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