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

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Given, \( \mathrm{H}_{2}(\mathrm{~g})+\mathrm{Br}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{HBr}(\mathrm{g}), \Delta \mathrm{H}_{1}^{\circ} \) and
\( \mathrm{P} \)
standard enthalpy of condensation of bromine is \( \Delta \mathrm{H}_{2}^{\circ} \)
W.
standard enthalpy of formation of \( \mathrm{HBr} \) at \( 25^{\circ} \mathrm{C} \) is
(1) \( \frac{\Delta \mathrm{H}_{1}^{\circ}}{2} \)
(2) \( \frac{\Delta \mathrm{H}_{1}^{\circ}}{2}+\Delta \mathrm{H}_{2}^{\circ} \)
(3) \( \frac{\Delta \mathrm{H}_{1}^{\circ}}{2}-\Delta \mathrm{H}_{2}^{\circ} \)
(4) \( \frac{\left(\Delta \mathrm{H}_{1}^{\circ}-\Delta \mathrm{H}_{2}^{\circ}\right)}{2} \)


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