Consider the generic reaction:
Determine the amount of heat emitted when each amount of reactant completely reacts (assume that there is more than enough of the other reactant).
(a) 2 mol A
(b) 3 mol A
(c) 3 mol B
(d) 5 mol B
Here, we are going to determine the amount of heat emitted when each amount of reactant completely reacts.
The given reaction is:
2A + 3B → C ΔHrxn = -125 kJ
The negative ΔHrxn indicates that the reaction is exothermic, i.e., heat is released during the reaction. Thus, the above reaction can be written as:
2A + 3B → C + 125 kJ(heat) -----(1)