I have a problem I need to get answer to Find the molar enthalpy of vaporization for a substance, given that 3.21 mol of the substance absorbs 28.4 kJ of energy as heat when the substance changes from a liquid to a gas.

Use the equation   [delta]H=[delta]H(sol/ w/e reaction type) x mol(given solute in moles)
                       Simplified:  [delta]H=[delta]H(sol) x mol              sub in value in question then solve for unkown