Interpretation:
The sign of
Concept introduction:
Exothermic reaction: A reaction is exothermic if heat is released in the
Endothermic reaction: A reaction is endothermic if heat is absorbed in the chemical reaction.

Answer to Problem 73A
For endothermic reaction,
For exothermic reaction,
Explanation of Solution
A reaction is endothermic if enthalpy of products is greater than reactants and exothermic when enthalpy of products is less than reactants.
As
Therefore,
The sign of
Chapter 15 Solutions
Chemistry: Matter and Change
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