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For a hypothetical reaction A to B then...

For a hypothetical reaction ` A to B` then activation energy for forward and backward reactions are 19 kJ/mol and 9 kJ /mol respectively. The heat of reaction is

A

`9 kJ mol ^(-1)`

B

`19 kJ mol ^(-1)`

C

`+ 10 kJ mol^(-1)`

D

`28 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta H _("Reaction") = E _(a ("Forward"))- E _(a ("Backward"))`
`= 19 - 9 = + 10 kJ mol ^(-1)`
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Knowledge Check

  • For a hypothetic reaction ArarrB , the activation energies for forward and backward reactions are 19 kJ/mole and 9 kJ/mole respectively. The heat of reaction is

    A
    28 kJ
    B
    19 kJ
    C
    10 kJ
    D
    9 kJ

  • In a hypothetical reaction A to B the activation energies for the forward and backward reactions are 15 and 9kJ//mol respectively. The potential energy of A is 10kJ//mol , then

    A
    the threshold energy of the reaction is `25kJ//mol`
    B
    potential energy of B is `16kJ`
    C
    heat of reaction is `6kJ`
    D
    the reaction is endothermic

  • In a hypothetical reaction, A rarr Y, the activation energies for the forward and backward reactions are 15 and 9 kJ mol^(-1) respectively. The potential energy of A is 10 kJ mol^(-1) . Which of the following is wrong?

    A
    Threshold energy of the reaction is 25 kJ.
    B
    The potential energy of Y is 16 kJ.
    C
    Heat of reaction is 6 kl.
    D
    The reaction is exothermic.
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