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    austentic's Avatar
    austentic Posts: 1, Reputation: 1
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    Jun 11, 2012, 03:40 AM
    Simple Hess's Law question. Difference between kJ and kJ/mol
    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?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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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 you 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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