Activation Energy

[IreneSeo3F]

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?

[Andreas Krumbein 1L]

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.

[605291562]

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.

[Joshua_Chan_3K]

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.

[Rachael Cohen 3G]

Those equations would still work. Personally, I find it most helpful to draw an energy diagram for these types of problems.

[Susanna Givan 2B]

Nope, the equations would be the same!