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Answer 1 · 2016-08-31T15:53:56

THE REACTION IS CALLED ENDOTHERMIC REACTION

![http://www.citycollegiate.com/chemical_kineticsXIb.htm]( useruploads.socratic.org )

This figure is obtained from the link given above.In this link concept of activation energy has been explained in detail.

Let

$Thresold Energy of Reaction = E_{t}$ $"Thresold Energy of Reaction "=E_t$

$Average Energy of Reatants = E_{r}$ $"Average Energy of Reatants "=E_r$

$Average Energy of Products = E_{p}$ $"Average Energy of Products "=E_p$

$Activation Energy of Forward Reactin = E_{a}^{f}$ $"Activation Energy of Forward Reactin"=E_a^f$

$Activation Energy of Backward Reactin = E_{a}^{b}$ $"Activation Energy of Backward Reactin"=E_a^b$

So

$E_{a}^{f} = E_{t} - E_{r}$ $E_a^f=E_t-E_r$

$E_{a}^{b} = E_{t} - E_{p}$ $E_a^b=E_t-E_p$

Now

$"Heat of reaction "DeltaH=E_p-E_r$

Again given cindition is

$E_a^f>E_a^b$

$=>E_t-E_r>E_t-E_p$

$=>E_p-E_r>0$

$=>DeltaH>0color(red)(->"Means the reaction is endothermic")$