how many grams of ethanol can be boiled?

Question

How many grams of ethanol, C₂H₅OH, can be boiled with 214.5 kj of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol.

Answer 1

The molar heat of vaporization tells you how much energy is needed to boil 1 mole of the substance.

In this case it takes 38.6kJ.

With 214.5kJ the number of moles of ethanol you can boil is: 214.5kJ / (38.6kJ/mol)

Use the molar mass to change moles into grams.