question_answer

The enthalpy for the following reactions \[\left( \Delta H{}^\circ  \right)\] at \[25{}^\circ C\]are given as : \[1/2{{H}_{2}}\,\left( g \right)\,\,+\,\,1/2\,{{O}_{2}}\,\left( g \right)\,\,\xrightarrow{{}}\,\,OH\,\left( g \right)\,:\,\Delta H\,\,=\,\,10.06\,\,kcals\]\[{{H}_{2}}\,\,\left( g \right)\,\,\xrightarrow{{}}\,\,2H\,\,\left( g \right)\,\,:\,\,\Delta H\,\,=\,\,104.18\,\,kcals\] \[{{O}_{2}}\,\,\left( g \right)\,\,\xrightarrow{{}}\,\,2O\,\,\left( g \right)\,\,:\,\,\Delta H\,\,=\,\,118.32\,\,kcals\] Calculate the \[O-H\] bond energy in the hydroxyl radical.

Answer:

-101.19