## warpedkitten one year ago Consider the following equation in chemical equilibrium. C2H4(g) + H2(g) <-> C2H6(g) + 137 kJ What happens to the amount of ethane (C2H6) when the temperature of the system is increased? a. The amount of ethane decreases. c. The amount of ethane increases. d. The amount of ethane decreases initially and then increases.

1. Photon336

What do you think? Consider heat as a product

2. warpedkitten

I don't know, c? I guessed B, but it wasn't correct. I don't understand any of it.

3. Photon336

So the rxn is exothermic. So heat is a product

4. Photon336

You're adding more heat so think of it this way the reaction is exothermic so when you add heat in there's too much heat so the reaction will go to the left and decrease the amount of product.

5. warpedkitten

I'm still not understanding what the answer would be then, or how to figure it out.

6. Rushwr

It's like this: We are given with the enthalpy right? It's a positive charged number which means this is an exothermic reaction. Because in exothermic reactions the heat is given out so enthalpy change is positive. Can u understand this part?

7. warpedkitten

I understand that.

8. Rushwr

When we increase the temperature the equilibrium becomes unstable right ?

9. warpedkitten

Yes. Would it be D, then? Or am I jumping too far ahead? Lol.

10. Rushwr

I thought it would be A though ! What do u think @Photon336 and @taramgrant0543664

11. Abhisar

According to Le Chatelier's principle the reaction always tries to minimize the stress developed by external conditions. In this case if we increase the temperature the reaction will try to do something which will decrease the temperature. Since the forward reaction is exothermic, equilibrium will shift toward backwards and hence more products will disintegrate to form reactants thus amount of ethane will decrease.