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Standard XII

Chemistry

Heat of Reaction

An exothermic...

Question

An exothermic reaction $A \to B$ has an activation energy of $17 k J$ per mole of A. The heat of the reaction is $40 k J$ . Calculate the activation energy for the reverse reaction $B \to A .$

60 k J

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57 k J

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75 k J

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90 k J

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Solution

The correct option is B $57 k J$
Exothermic reaction
According to graph,
$E_{1 (b)} = E_{a (f)} + Δ H$
$= 17 + 40$
$= 57 k J$ $m o l^{- 1}$

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An exothermic reaction A→B has an activation energy of 17kJ per mole of A. The heat of the reaction is 40kJ. Calculate the activation energy for the reverse reaction B→A.

The correct option is B 57kJExothermic reactionAccording to graph,E1(b)=Ea(f)+ΔH=17+40=57kJ mol−1

An exothermic reaction $A \to B$ has an activation energy of $17 k J$ per mole of A. The heat of the reaction is $40 k J$ . Calculate the activation energy for the reverse reaction $B \to A .$

The correct option is B $57 k J$
Exothermic reaction
According to graph,
$E_{1 (b)} = E_{a (f)} + Δ H$
$= 17 + 40$
$= 57 k J$ $m o l^{- 1}$