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Simple Hess's Law question. Difference between kJ and kJ/mol

Asked Jun 11, 2012, 03:40 AM — 1 Answer
I have a sheet on Hess's Law where Enthalpy change is sometimes given as kJ and other times kJ/mol.
Why? What's the difference?

The latter is given as "The heat of vaporisation of water is 44kJ/mol. Calculate the heat of reaction [gaseous ethanol]..."
Why is it kJ/mol and should the heat of reaction be given as kJ or kJ/mol?

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ebaines Posts: 10,046, Reputation: 5534
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Jun 11, 2012, 08:00 AM
Enthalpy is measured in kJ/mole. The heat of reaction may also be expressed in kJ/mole, but if you know how many moles of material are involved yuo can calculate the total heat released (or absorbed) by a reaction in kJ. Converesely, in a lab experiment you might measure the heat produced in kJ, and the calculate the enthalpy of the materials in terms of kJ/mole.
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