A) \[-196\,kJ/mole\]
B) \[146\,kJ/mole\]
C) \[-494\,kJ/mole\]
D) \[-98\,kJ/mole\]
Correct Answer: A
Solution :
\[{{H}_{2}}+{{O}_{2}}\to {{H}_{2}}{{O}_{2}}\] \[\Delta H_{f}^{o}=-188\,kJ/mole\] ?.(i) \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to {{H}_{2}}O\] \[\Delta H_{f}^{o}=-286\,kJ/mole\] ?.(ii) eq. (i) ? eq. (ii) × 2 gives the required result.
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