An exothermic reaction X - Y has an activation energy 30 kJ mol-1- If energy change - E during the reaction is -20 kJ- then the activation energy for the reverse reaction in kJ is - Integer answer

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Byju's Answer

Standard XII

Chemistry

Methods for Ester Synthesis

An exothermic...

Question

An exothermic reaction $X \to Y$ has an activation energy $30 k J m o l^{- 1}$ . If energy change $Δ E$ during the reaction is $- 20 k J$ , then the activation energy for the reverse reaction in $k J$ is __________. (Integer answer)

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Solution

For exothermic reaction, the enthalpy change is negative.
$Δ H = - v e$
Thus, for exothermic reaction, the energy of products will be lesser than reactants.

$X \to Y$

$(E_{a})_{f} = 30 k J m o l^{- 1}$
$Δ E = (E_{a})_{f} - (E_{a})_{b}$

$- 20 = 30 = - (E_{a})_{b}$

$\Rightarrow (E_{a})_{b} = 50 k J$

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An exothermic reaction X→Y has an activation energy 30 kJ mol−1. If energy change ΔE during the reaction is −20 kJ, then the activation energy for the reverse reaction in kJ is __________. (Integer answer)

For exothermic reaction, the enthalpy change is negative. ΔH=−ve Thus, for exothermic reaction, the energy of products will be lesser than reactants. X→Y (Ea)f=30kJ mol−1 ΔE=(Ea)f−(Ea)b −20=30=−(Ea)b ⇒ (Ea)b=50 kJ

An exothermic reaction $X \to Y$ has an activation energy $30 k J m o l^{- 1}$ . If energy change $Δ E$ during the reaction is $- 20 k J$ , then the activation energy for the reverse reaction in $k J$ is __________. (Integer answer)