1.

H_(2)O_(2) is formed in the upper atmosphere through the following mechanism H_(2)O+(O) to 2" OH" to H_(2)O_(2) The overall enthalpy change and activation energy for the forward reaction are 72" kJ mol"^(-1) and 77" kJ mol"^(-1) respectively. The activation energy for the decomposition of H_(2)O_(2) to give back H_(2)O and (O) will be

Answer»

`5" KJ mol"^(-1)`
`-5" kJ mol"^(-1)`
`149" kJ mol"^(-1)`
`-149" kJ mol"^(-1)`

SOLUTION :Activation ENERGY for bhackward reaction `=77-72=5 " kJ mol"^-1`.


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