A) \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l);\,\Delta H=-116\,kcal\]
B) \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(l);\,\Delta H=-58\,kcal\]
C) \[{{H}^{+}}(aq.)+O{{H}^{-}}(aq.)\to 2{{H}_{2}}O(l);\,\Delta H=-13.7\,kcal\]
D) \[{{C}_{2}}{{H}_{2}}(g)+2\frac{1}{2}{{O}_{2}}(g)\to 2C{{O}_{2}}(g)+{{H}_{2}}O(l)\]; \[\Delta H=-310\,kcal\]
Correct Answer: B
Solution :
Heat of formation is the formation of one mole of the substance from its elements.
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