Chemistry

Problem

\text{H}_2\text{O}

and oxygen atoms react in upper atmospheric level bimolecularly to form two OH radicals having heat of reaction

72 \text{ kJ}

400 \text{ K}

and energy of activation being

77 \text{ kJ mol}^{-1}

E_a

for bimolecular combination of two OH radicals to form

\text{H}_2\text{O}

and O-atom is : a.

-5 \text{ kJ}

+5 \text{ kJ}

-10 \text{ kJ}

+10 \text{ kJ}