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    Deciding if a Reaction is Endo- or Exothermic

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    Calculate the value of Delta S when 1.00 mole of ethanol is vaporized at 78.0°C and 1.00 atm.

    I get 110 J/K mol, but is it a negative or positive number, I want to say because of vaporization it is an endothermic response which would make the number 110 J/K mol.

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    Hello and thank you for posting your question to Brainmass.

    Yes, your reasoning is correct. Heat Q flows *into* the system thus it has a positive value.
    Entropy change is the ratio between the heat amount and the ...

    Solution Summary

    This solution helps with a problem about thermodynamics.