[supernerd707]

So the question goes:

Sketch an enthalpy- R.C. diagram for a reaction which has  :delta:H_r = =20 kJ/mol and an activation energy E_a = 50 kJ/mol.

I think i've got the correct diagram drawn. Just a basic exothermic diagram. However i'm not sure if the Ea *Ignore me, I am impatient* has to be greater than the change in Hr, since the Ea=50kJ/mol?

There are some follow up questions that i am very confused on as well, and i left my chem book at school so I don't know where to look it up...

a) What is the value of the heat of reaction for the reverse reaction?
b) what is the value of the activation energy for the reverse reaction?
Which would be a quicker reaction, the forward reaction or the reverse reaction? Explain.

We haven't talked about reverse reactions yet in school...so I'm lost a little.

[Schrödinger]

If a forward reaction is exothermic, then the reverse reaction, by logic, should be endothermic, with the amount of heat absorbed in the latter being the exact same amount as is released in the former. (ofcourse, the signs being opposite)

I would appreciate it if you could attach your enthalpy-RC diagram in your reply. You can decipher a lot from it.

[rabolisk]

I think i've got the correct diagram drawn. Just a basic exothermic diagram. However i'm not sure if the Ea *Ignore me, I am impatient* has to be greater than the change in Hr, since the Ea=50kJ/mol?

If I'm an instructor, that's something I would look for. I wouldn't take out a ruler and measure it, but I would not give full credit unless the Ea *Ignore me, I am impatient* is noticeably greater.