The forward and backward activation energy of exothermic reaction A- B is 20 and 100 kJ mol-1 respectively- The enthalpy change of the forward reaction A - B in kJ-mol will be -

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Activation Energy

The forward a...

Question

The forward and backward activation energy of exothermic reaction $A \to B$ is $20 and 100 k J m o l^{- 1}$ respectively. The enthalpy change of the forward reaction $A \to B$ ( in $k J / m o l$ ) will be :

-120

No worries! We‘ve got your back. Try BYJU‘S free classes today!

120

No worries! We‘ve got your back. Try BYJU‘S free classes today!

-80

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C -80
The given reaction is an exothermic reaction

$E_{a_{F}}$ =Activation energy of the forward reaction
$E_{a_{B}}$ = Activation energy of the backward reaction

Enthalpy change can be expressed also in terms of activation energy,

$Δ H = E_{a_{F}} - E_{a_{B}}$

$Δ H = E_{f} - E_{b}$
$Δ H = 20 - 100$
$Δ H = - 80 k J / m o l$

Suggest Corrections

Similar questions

Q. In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively

- x k J m o l^{- 1}

and

y k J m o l^{- 1}

. Therefore, the energy of activation in the backward direction, in

k J m o l^{- 1}

is:

In an exothermic reaction $A \to B$ , the activation energy of reverse reaction is twice that of forward reaction. If enthalpy of the reaction is -80 kJ $m o l^{- 1}$ , the activation energy of the reverse reaction is :

If a reaction, $A + B \to C$ is exothermic to the extent of 30 kJ/mol and the forward reaction has an activation energy 70 kJ/mol, the activation energy for the reverse reaction is (in kJ/mol):

Q. If a reaction