Homework Help: chemistry

Posted by Chioma on Monday, November 7, 2011 at 5:28pm.

Calculate the enthalpy of reaction for the following:

N2 + 3H2 -> 2NH3 they are all gases.

Is this reaction endothermic or exothermic?

chemistry - DrBob222, Monday, November 7, 2011 at 6:25pm
Look up delta Hf values in your text or notes, then calculate
deltaHrxn = (n*DHproducts)-(DHreactants).
The sign is - for exothermic; + for endothermic.
chemistry - Chioma, Monday, November 7, 2011 at 6:34pm
Thanks!
chemistry--typo - DrBob222, Monday, November 7, 2011 at 8:37pm
I omitted an n in that. It should be
deltaHrxn = (n*DHfproducts) - (n*DHfreactants)

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