The molar mass of a volatile organic liquid is measured by weighing the mass of an empty flask of kn — Laboratory Chemistry Chemistry Question
Question
The molar mass of a volatile organic liquid is measured by weighing the mass of an empty flask of known volume, adding some of the liquid, heating the flask in a water bath until the liquid has just vaporized completely, then sealing the flask, letting it cool, and remeasuring the mass of the flask with the remaining organic compound. Which error will lead to a calculated value of the molar mass that is lower than the theoretical value?
The flask is not sealed promptly after the last of the compound vaporizes.
The organic compound dimerizes to an appreciable extent in the gas phase.
The barometric pressure was assumed to be 1 atm but in fact was greater than 1 atm.
The volume of the flask used in the calculation is smaller than the true volume.