A to B DeltaH=-10KJ mol, Ea=50KJ // mol...

`A to B `DeltaH`=-10KJ mol, E_a=50KJ // mol` then activation energy of `B to A ` would be

`-60KJmol^-1`

`50KJmol^-1`

-50KJmol^-1

60KJmol^-1

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