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Standard XII

Chemistry

Heat of Reaction

If a reaction...

Question

If a reaction $A + B \to C$ is exothermic to the extent of 30 kJ mol $^{- 1}$ and the forward reaction has an activation energy of 249 kJ mol $^{- 1}$ , the activation energy for reverse reaction in kJ mol $^{- 1}$ is:

324

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279

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40

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100

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Solution

The correct option is A $279$
Given that,
$Δ H = - 30$ kJ/mol......[exothermic reaction]

$E_{f} = 249 k J / m o l$

Now,
$Δ H = E_{f} - E_{b}$

$E_{b} = E_{f} - Δ H$

$E_{b} = 249 - (- 30) = 279 k J / m o l$

Option B is correct.

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If a reaction A+B→C is exothermic to the extent of 30 kJ mol−1 and the forward reaction has an activation energy of 249 kJ mol−1, the activation energy for reverse reaction in kJ mol−1 is:

The correct option is A 279Given that, ΔH=−30 kJ/mol......[exothermic reaction]Ef=249 kJ/molNow,ΔH=Ef−EbEb=Ef−ΔHEb=249−(−30)=279kJ/molOption B is correct.

If a reaction $A + B \to C$ is exothermic to the extent of 30 kJ mol $^{- 1}$ and the forward reaction has an activation energy of 249 kJ mol $^{- 1}$ , the activation energy for reverse reaction in kJ mol $^{- 1}$ is:

The correct option is A $279$
Given that,
$Δ H = - 30$ kJ/mol......[exothermic reaction]

$E_{f} = 249 k J / m o l$

Now,
$Δ H = E_{f} - E_{b}$

$E_{b} = E_{f} - Δ H$

$E_{b} = 249 - (- 30) = 279 k J / m o l$

Option B is correct.