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For a hypothetical reaction, the mean po...

For a hypothetical reaction, the mean potential energies of reactants and products are 40 and 25 kcal per mol respectively.
Calculate the activation energies of the forward and the reverse reactions if the threshold energy is 65 kcal. Also calculate the heat of the reaction.

Text Solution

Verified by Experts

Given that,
Mean potential energies of reactants `= 40` kcal/mol
Mean potential energies of products `= 25` kcal/mol
From the equation,
Threshold energy = Activation energy + energy possessed by reacting species
`65 =` Activation energy `+ 40`
Activation energy of reactants `=25` kcal/mol
Similarly, activation energy of products `=40` kcal/mol
Heat of reaction = Energy of product - Energy of reactant
`= 25- 40 = -15` kcal/mol
Thus, (-) sign shows that reaction is exothermic.
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