Activation Energy

[marymatthews]

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From Chad's questions:

If the activation energy of a reaction is 50kJ and ​

ΔH=15kJ, what is the activation energy of the reverse reaction? ​

A) 35kJ ​

B) -35kJ
C) 65kJ
D) -65kJ


How do you know the forward reaction is Endothermic? Couldn't it just be 50+15 = 65 (if exothermic)?​

 

[UndergradGuy7]

From Chad's questions:

If the activation energy of a reaction is 50kJ and ​

ΔH=15kJ, what is the activation energy of the reverse reaction? ​

A) 35kJ ​

B) -35kJ
C) 65kJ
D) -65kJ


How do you know the forward reaction is Endothermic? Couldn't it just be 50+15 = 65 (if exothermic)?​

You know the forward reaction is endothermic because dH is positive.

 

[marymatthews]

You know the forward reaction is endothermic because dH is positive.

dH?

 

[Avery07]

dH?

deltaH

Change in enthalpy.

 

[torobcheh21]

sorry for bringing up an old question...but shouldn't the answer be negative because we're going in the reverse direction of an endothermic rxn??

 

[Troyvdg]

sorry for bringing up an old question...but shouldn't the answer be negative because we're going in the reverse direction of an endothermic rxn??

delta H would be negative, since it's exothermic, but we're looking for activation energy, which can't be negative

 

[torobcheh21]

ahhhh that's right thanks troyvdg