Experiment 10: Determination of Molar Mass by Vapor Density Introduction In this experiment a volatile liquid will be vaporized and the volume occupied by the vapor, along with its mass, will be measured. Knowing the temperature of the vapor and the atmospheric pressure, we can use the ideal gas equation to calculate the molar mass of the liquid as follows: PV nRT where n moles of gas Since moles g/MM, we substitute into the equation for n: PV-RT Rearranging the equation to solve for molar mass we get: gRT PV
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