For #17 of the sapling hw, the question asks:
A certain reaction has deltaH=34kJ and Ea=46kJ.
What is the Ea of the reverse reaction?
For this reaction, the equations that were used are:
Ea(forward)=E(transition)-E(r)
DeltaH=E(p)-E(r)
Would the equations be different if the reaction was exothermic?
Activation Energy
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Re: Activation Energy
Since the enthalpy (dH) would be negative if the reaction was exothermic, the equations you listed would still be equally applicable in an exothermic reaction.
Re: Activation Energy
Hi! the equations are still valid for exothermic you will just get a negative number, although because exothermic reactions happen spontaneously I think it is fairly rare to see them reversed.
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Re: Activation Energy
That equation would still work. Another way to check your work for this problem is to draw the energy diagram and label delta H and the activation energies.
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Re: Activation Energy
Those equations would still work. Personally, I find it most helpful to draw an energy diagram for these types of problems.
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