posted by Chioma .
Calculate the enthalpy of reaction for the following:
N2 + 3H2 -> 2NH3 they are all gases.
Is this reaction endothermic or exothermic?
Look up delta Hf values in your text or notes, then calculate
deltaHrxn = (n*DHproducts)-(DHreactants).
The sign is - for exothermic; + for endothermic.
I omitted an n in that. It should be
deltaHrxn = (n*DHfproducts) - (n*DHfreactants)