Question

The change in enthalpy for the reaction A - P is x kj/mol. what does the enthalpy change for the reaction P - A​

Answer 1

The enthalpy change for the reaction P - A​  is -x kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

$A\rightarrow P$  $\Delta H=xkJ/mol$

For the reverse reaction, the enthalpy would remain same but the sign of enthalpy would change.

$P\rightarrow A$  $\Delta H=-xkJ/mol$

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