[g1sk8terz]

what is the difference btween heat of rxn and heat of formation....is there any relationship?

[xiankai]

the heat of reaction is based on a specific set of moles of reactants reacting with moles of products.

however, the heat of formation is the specific set of moles of reactants reacting with 1 mole of product.

eg.

N2 + 3H2 --> 2NH3 (delta H = x)

0.5 N2 + 1.5 H2 --> NH3 (delta H = x/2)

the former is the heat of reaction, while the later is the heat of formation of ammonia.

[g1sk8terz]

thanks