The molar mass of a volatile liquid (b.p. `lt 90^(@)C`) is to be detemined by measuring the density of its vapour in an Erlenmeyer flask cpped with Al foil with a pinhole to allow the vapour to escape. A sample of the liquid is added to the pre-weighed flask that is heated in a water bath until the liquid has evaporated, after which the flask is dried and reweighed. Which piece of information is not required to determine the molar mass of the liquid?

Options

A. Barometric pressure
B. Mass of liquid sample
C. Temperature of water
D. Volume of the flask

Answer

B