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Question

Given the following thermochemical equations,

CaO(s)+Cl2(g)CaOCl2(s)ΔH=110.9 kJH2O(l)+CaOCl2(s)+2NaBr(s)2NaCl(s)+Ca(OH)2(s)+Br2(l)ΔH=60.2 kJCa(OH)2(s)H=+65.1 kJ\begin{array}{cc} \mathrm{CaO}(s)+\mathrm{Cl}_2(g) \longrightarrow \mathrm{CaOCl}_2(s) & \Delta H^{\circ}=-110.9 \mathrm{~kJ} \\ \mathrm{H}_2 \mathrm{O}(l)+\mathrm{CaOCl}_2(s)+2 \mathrm{NaBr}(s) \longrightarrow & 2 \mathrm{NaCl}(s)+\mathrm{Ca}(\mathrm{OH})_2(s)+\mathrm{Br}_2(l) \\ \Delta H^{\circ}=-60.2 \mathrm{~kJ} \\ \mathrm{Ca}(\mathrm{OH})_2(s) \longrightarrow H^{\circ}=+65.1 \mathrm{~kJ} \end{array}

calculate the value of ΔH\Delta H^{\circ} (in kilojoules) for the reaction

12Cl2(g)+NaBr(s)NaCl(s)+12Br2(l)\frac{1}{2} \mathrm{Cl}_2(g)+\mathrm{NaBr}(s) \longrightarrow \mathrm{NaCl}(s)+\frac{1}{2} \mathrm{Br}_2(l)

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A task is to calculate the value of ΔHo\mathrm{\Delta H^o} (in kilojoules) for the reaction given:

12Cl2(g)  +  NaBr(s)    NaCl(s)  +  12Br2(l)\mathrm{\frac{1}{2}Cl_2 (g)\;+\;NaBr(s)\; \longrightarrow\;NaCl(s)\;+\; \frac{1}{2} Br_2 (l)}

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