Question

What are the values of $∆\mathrm{H}$ for endothermic and exothermic reactions?

Answer 1

Exothermic and Endothermic reactions:

• The reaction in which the heat is released is known as an Exothermic reaction.
• The reaction in which the heat is absorbed is known as an Endothermic reaction.

Change in Enthalpy:

• “$\mathrm{H}$ (Enthalpy) is a state function because it depends on $\mathrm{U},\mathrm{P},\mathrm{and}\mathrm{V}$ all of which are state functions”.
• Thus, $∆\mathrm{H}$ is independent of the path.
• "$∆\mathrm{H}$ is negative for exothermic reactions which liberate heat during the reaction and $∆\mathrm{H}$ is positive for endothermic reactions which absorb heat from the surroundings".