For A+B → C+D, Δ H=-20 KJ mol-1. The activation energy of the forward reaction is 85 KJ mol-1. The activation energy for backward reaction is ......... KJ mol-1.

Question

For A+B → C+D, Δ H=-20 KJ mol-1. The activation energy of the forward reaction is 85 KJ mol-1. The activation energy for backward reaction is ......... KJ mol-1. (A) 65 (B) 105 (C) 85 (D) 40

Tardigrade Admin · Accepted Answer

For a reaction, Ea for forward reaction = Ea for backward reaction + ΔH ∴ 85=Ea(back)-20 or Ea(back)=105 KJ mol-1

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

65

105

85

40

For a reaction, $E_{a}$ for forward reaction = $E_{a}$ for backward reaction + $Δ$ H
$∴ 85 = E_{a (ba c k)} - 20 or E_{a (ba c k)} = 105 K J m o l^{- 1}$

Q. For A+B→C+D,ΔH=−20KJmol−1. The activation energy of the forward reaction is 85 KJ mol−1. The activation energy for backward reaction is ......... KJ mol−1.

65

105

85

40

For a reaction, Ea​ for forward reaction = Ea​ for backward reaction + ΔH ∴85=Ea(back)​−20orEa(back)​=105KJmol−1

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

For a reaction, $E_{a}$ for forward reaction = $E_{a}$ for backward reaction + $Δ$ H
$∴ 85 = E_{a (ba c k)} - 20 or E_{a (ba c k)} = 105 K J m o l^{- 1}$