According to the following figure, the magnitude of the enthalpy change of the reaction

Question:

According to the following figure, the magnitude of the enthalpy change of the reaction

$\mathrm{A}+\mathrm{B} \rightarrow \mathrm{M}+\mathrm{N}$ in $\mathrm{kJ} \mathrm{mol}^{-1}$

is equal to____________(Integer answer)

Solution:

$\Delta \mathrm{H}=\mathrm{E}_{\mathrm{a}_{\mathrm{f}}}-\mathrm{E}_{\mathrm{a}_{\mathrm{b}}}$

$=20-65$

$=-45 \mathrm{KJ} / \mathrm{mol}$

$|\Delta \mathrm{H}|=45 \mathrm{KJ} / \mathrm{mol}$

 

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