IB Chemistry HL 1.2.4 Hess's law applications Question Bank

Practise IB Chemistry HL 1.2.4 by applying hess's law applications to exam-style questions.

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Phosphoryl chloride, $\mathrm{POCl}_{3}$ , is a dehydrating agent.

$\quad \mathrm{POCl}_{3}(\mathrm{~g})$ decomposes according to the following equation.

2 \mathrm{POCl}_{3}(\mathrm{~g}) \rightarrow 2 \mathrm{PCl}_{3}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})

Calculate the standard enthalpy change for the reaction, $\Delta H^{\ominus}$ , in $\mathrm{kJ} \mathrm{mol}^{-1}$ , using the data below.

$\left.\left(\Delta H^{\ominus}=[(2)(-288.1)]-[(2)(-542.2)]\right)=\right)(+) 508.2\left(\mathrm{~kJ} \mathrm{~mol}^{-1}\right)$ ;

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