MyQuestionIcon

8

You visited us 8 times! Enjoying our articles? Unlock Full Access!

Activation Energy

For the equil...

Question

For the equilibrium, $A (g) ⇌ B (g), △ H$ is $- 40 k J / m o l$ . If the ratio of the activation energies of the forward $(E_{f})$ and reverse $(E_{b})$ reactions is $2 / 3$ then:

A

E_{f} = 60 k J / m o l; E_{b} = 100 k J / m o l

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

B

E_{f} = 30 k J / m o l; E_{b} = 70 k J / m o l

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

C

E_{f} = 80 k J / m o l; E_{b} = 120 k J / m o l

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

D

E_{f} = 70 k J / m o l; E_{b} = 30 k J / m o l

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

Open in App

Solution

The correct option is D $E_{f} = 80 k J / m o l; E_{b} = 120 k J / m o l$
The given reaction is,
$A (g) ⇌ B (g)$
$△ H = - 40 K J / m o l$
& $\frac{E_{f}}{E_{b}} = \frac{2}{3} \Rightarrow E_{f} = \frac{2}{3} E_{b}$
From graph we have,
$△ H = E_{b} - E_{f}$
$\Rightarrow - 40 = E_{b} - \frac{2}{3} E_{b}$
$\Rightarrow - 40 = \frac{1}{3} E_{b} \Rightarrow E_{b} = - 120 K J / m o l$
& $E_{f} = E_{b} - △ H$
$= - 120 - (- 40)$
$- 80$ $K J / m o l$ .

Suggest Corrections

thumbs-up

0

Similar questions

Q. For the equilibrim,

A (g) ⇌ B (g)

Δ H = - 40 k J / m o l

. If the ratio of the activation energies of the forward

(E_{f})

(E_{b})

\frac{2}{3}

Q. For the system

A (g) ⇌ B (g), △ H

for the forward reaction is

- 33 K J / m o l

△ H = △ E

in this case). What will be the equilibrium constant

K

at 300 K. If the activation energies

E_{f}

E_{b}

are in the ratio 20:31, Calculate

E_{f}

E_{b}

at this temperature? (Assume that the pre-exponential factor is the same for the forward and backward reactions)

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. Consider an endothermic reaction

X \to Y

with the activation energies

E_{b}

E_{f}

for the backward and forward reactions respectively. Here

If E_f and E_bare the activation energies of the forward and reverse reactions and the reaction is known to be exothermic, then:

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Collision Theory

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Activation Energy

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon