The activation energies of the forward and reverse reactions in the case of a chemical reaction are 30.5 and 45.4 kJ / mol respectively. The reaction is

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\displaylines Δ H = A c t i v a t i o n e n er g y o ff or w a r d re a c t i o n − A c t i v a t i o n e n er g y o f ba c k w a r d re a c t i o n Δ H = 30.5 − 45.4 = − 14.9 k J Since Δ H is negative, the reaction is exothermic.

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