Question

The reaction x y is an exothermic reaction. Activation energy of the reaction for x into y is 150 kj mol1. Enthalpy of reaction is 135 kj mol1. The activation energy for reverse reaction, y x will be:

Answer 1

Answer:

Activation energy of reverse reaction (Ea2) = 15 kJ/ mol

Explanation:

Given

Activation energy from x to y (Ea1) =150 kJ/ mol

Enthalpy of reaction (ΔH) = 135 kJ/ mol

Activation energy of reverse reaction (Ea2) = ??

Solution

Ea1 is from reactant to transition state

ΔH is from reactant to products

thus,

Ea2 is from product to transition state

Ea2 = Ea1 - ΔH

Ea2 = 150 - 135

Ea2 = 15 kJ/mol