Question

Which of the following is correct for the equation below?
2P(s) + 3Cl¿(g) d 2PClÀ(g) + 574 kJ

Answer 1

-574
+287
-287
+574

Answer 2

Correct for what? The enthalpy of reaction?

Answer 3

yes

Answer 4

Oh, ok. Since the heat is in the products that makes this reaction exothermic. Do you know if the enthalpy of exothermic reactions is positive or negative?

Answer 5

negative?

Answer 6

Yep. :-) And how much heat is released for one reaction?

Answer 7

I'm not sure with that part.

Answer 8

Well, 574 kJ is in the products of the balanced reaction.

Answer 9

so then -287

Answer 10

Why would you think -287?

Answer 11

I thought since that was the total and it had to be negative it was the 287?

Answer 12

It does have to be negative, but I get -574