Knowing the molar mass we can calculate the volume occupied by 3 x 0.65 g liquid in vapor phase.
When vaporized at the barometric pressure and temperature of your boiling water bath in run 1.
The boiling point of water at 1 atm. = 100 C = 100 + 273 = 373 K
standard STP temperature = 273 K
STP volume = 22.4 L
Temperature = (373/273) = 1.37
if the density of your unknown liquid is 0.65 g/ml.
density = 0.65 g/ml
Volume of 3 ml liquid when evaporated
= ((3 x 0.65)g/molar mass x 22.4 x 1.37
Substances take up space and have mass. Molecules, which make up substances. If we already know the number of moles needed then we can use the concept of molar mass to calculate how many grams of the substance are required. The molar mass is also known as molecular weight. It is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule. The unit used to measure is grams per mole.
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