Given, \( \mathrm{H}_{2}(\mathrm{~g})+\mathrm{Br}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{HBr...

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Given, \( \mathrm{H}_{2}(\mathrm{~g})+\mathrm{Br}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{HBr}(\mathrm{g}), \Delta \mathrm{H}_{1}^{0} \) and standard enthalpy of condensation of bromine is \( \Delta \mathrm{H}_{2}^{0} \). Standard enthalpy of formation of \( \mathrm{HBr} \) at \( 25^{\circ} \mathrm{C} \) is:
(a) \( \Delta \mathrm{H}_{1}^{0} / 2 \)
(b) \( \Delta \mathrm{H}_{1}^{0} / 2+\Delta \mathrm{H}_{2}^{0} \)
(c) \( \Delta \mathrm{H}_{1}^{0} / 2-\Delta \mathrm{H}_{2}^{0} \)
(d) \( \left(\Delta \mathrm{H}_{1}^{0}-\Delta \mathrm{H}_{2}^{0}\right) / 2 \)
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