For a reaction, $A \to B; Δ H = 20 k J . {m o l}^{- 1}$ , the activation energy of the forward reaction is $85 k J / m o l$ . The activation energy of the backward reaction will be:

105 k J / m o l

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65 k J / m o l

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45 k J / m o l

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75 k J / m o l

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Solution

The correct option is B $65 k J / m o l$
Energy of activation for forward reaction ( $E_{a}) = 85 k J / m o l$ and $Δ H = 20 k J / m o l$

$∴$ Energy of activation for backward reaction

$E_{b} = E_{a} - Δ H = 85 - 20 = 65 k J {m o l}^{- 1}$

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For the reaction $A + B \to C + D Δ H = - 20 k J m o l^{- 1}$ . The activation energy of the forward reaction is $85 k J m o l^{- 1}$ . The activation energy for backward reaction is

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For the reaction $A + B \to C + D Δ H = - 20 k J m o l^{- 1}$ . The activation energy of the forward reaction is $85 k J m o l^{- 1}$ . The activation energy for backward reaction is