An exothermic reaction \( \mathrm{X} \rightarrow \mathrm{Y} \) has an activation energy \( 30 \m...

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An exothermic reaction \( \mathrm{X} \rightarrow \mathrm{Y} \) has an activation energy \( 30 \mathrm{~kJ} \mathrm{~mol}^{-1} \). If energy change \( \Delta \mathrm{E} \) during the reaction is \( -20 \mathrm{~kJ} \), then the activation energy for the reverse reaction in \( \mathrm{kJ} \) is . (Integer answer)
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