Minus One Hundred Kilojoules — Per What?

ΔH_rxn = −100 kJ looks like a fact about a reaction. It is really a fact about one mole of that reaction, as it is written, at constant pressure. Change how much reacts and the heat changes with it, in exact proportion. Watch the number that never moves and the heat that always does.

8 STEPS · 6 QUICK CHECKS · q = n · ΔH_rxn · ΔH_rxn = −100 kJ/mol rxn · v2