Energy of activation of forward reaction for an endothermic process is 90 k J. If enthalpy change for the reaction is 50 k J then activation energy for backward reaction will be

Question

Energy of activation of forward reaction for an endothermic process is 90 k J. If enthalpy change for the reaction is 50 k J then activation energy for backward reaction will be (A) 40 kJ (B) 140 kJ (C) 90 kJ (D) 50 kJ

Tardigrade Admin · Accepted Answer

Given, Ef=90 kJ Eb=? Δ H=50 kJ Δ H=Ef-Eb 50=90-Eb Eb=(90-50) kJ Eb=40 kJ

Q. Energy of activation of forward reaction for an endothermic process is $90 k J$ . If enthalpy change for the reaction is $50 k J$ then activation energy for backward reaction will be

40 kJ

140 kJ

90 kJ

50 kJ

Given, $E_{f} = 90 k J E_{b} = ?$
$Δ H = 50 k J$
$Δ H = E_{f} - E_{b}$
$50 = 90 - E_{b}$
$E_{b} = (90 - 50) k J$
$E_{b} = 40 k J$

Q. Energy of activation of forward reaction for an endothermic process is 90kJ. If enthalpy change for the reaction is 50kJ then activation energy for backward reaction will be