Chemistry - Thermochemistry Question with Solution | TestHub

Using given reaction,

(i) $\frac{1}{4}{\mathrm{P}}_{4(\mathrm{s})}⟶{\mathrm{P}}_{(\mathrm{g})};\Delta {\mathrm{H}}^{\circ }=+74.2\mathrm{kcal}$

(ii) $\frac{1}{2}{\mathrm{H}}_{2(\mathrm{g})}⟶{\mathrm{H}}_{(\mathrm{g})};\Delta {\mathrm{H}}^{\circ }=+52.1\mathrm{kcal}$

(iii) ${\mathrm{P}}_{\left(\mathrm{g}\right)}+3{H_{(g)}+PH}_{3(\mathrm{g})}$ ; $\Delta {\mathrm{H}}^{\circ }=-229.3\mathrm{kcal}$

Determine enthalpy change ΔH for the reaction,

$$4{\mathrm{PH}}_{3\left(\mathrm{g}\right)}{P_{4(S)}+6H}_{2(\mathrm{g})}$$