The reaction A+B→ C+D+40 kJ has an activation energy of 18 kJ. Then the activation energy for the reaction C+D→ A+B is

Question

The reaction A+B→ C+D+40 kJ has an activation energy of 18 kJ. Then the activation energy for the reaction C+D→ A+B is (A) 58 kJ (B)  -40 kJ  (C)  -18 kJ  (D)  22 kJ

Tardigrade Admin · Accepted Answer

A+B arrow C+D+40 kJ ∵ Activation energy for the forward reaction, A+Barrow C+D=18 kJ ∴ Activation energy for the reverse reaction, C+Darrow A+B=40+18=58 kJ

Q. The reaction $A + B \to C + D + 40 k J$ has an activation energy of $18 k J$ . Then the activation energy for the reaction $C + D \to A + B$ is

$58 k J$

$- 40 k J$

$- 18 k J$

$22 k J$

$A + B \to C + D + 40 k J$
$∵$ Activation energy for the forward reaction,
$A + B \to C + D = 18 k J$
$∴$ Activation energy for the reverse reaction,
$C + D \to A + B = 40 + 18 = 58 k J$

Q. The reaction A+B→C+D+40kJ has an activation energy of 18kJ. Then the activation energy for the reaction C+D→A+B is

58kJ

−40kJ

−18kJ

22kJ