Chemistry - Thermochemistry Question with Solution | TestHub

If the enthalpies of formation of ${\mathrm{Al}}_2{\mathrm{O}}_3$ and ${\mathrm{Cr}}_2{\mathrm{O}}_3$ are -1596 kJ and -1134 kJ respectively, then the value of $\Delta \mathrm{H}$ for the reaction $2\mathrm{Al}+{\mathrm{Cr}}_2{\mathrm{O}}_3⟶2\mathrm{Cr}+{\mathrm{Al}}_2{\mathrm{O}}_3$ is