Using Hess's Law, what is the ▲H rxn for:
2C(s) + O2(g) >>>>> 2CO(g)
C(s) + O2 >>>>> CO2(g) ▲H= -393.7KJ/mol
CO(g) + ½O2 >>> CO2(g) ▲H= -283.3KJ/mol
When I did this problem I got an answer that was way off apparently. By using ▲H = Σ▲H(products) - Σ▲H(rxtnts) Shouldn't you write(?):
-((2(-283)) - 2(-393)? This would give me +566 -(-786) = +1352KJ. I was really confused to see that the answer was -220KJ and the way that it was set up seemed opposite to me. The answer said 2(-393KJ)-(-2(283KJ)) = -220KJ. To me it looks like the ▲H = reactants - products. Anyways, for this particular problem there's something i'm not seeing... please help!! Thanks
2C(s) + O2(g) >>>>> 2CO(g)
C(s) + O2 >>>>> CO2(g) ▲H= -393.7KJ/mol
CO(g) + ½O2 >>> CO2(g) ▲H= -283.3KJ/mol
When I did this problem I got an answer that was way off apparently. By using ▲H = Σ▲H(products) - Σ▲H(rxtnts) Shouldn't you write(?):
-((2(-283)) - 2(-393)? This would give me +566 -(-786) = +1352KJ. I was really confused to see that the answer was -220KJ and the way that it was set up seemed opposite to me. The answer said 2(-393KJ)-(-2(283KJ)) = -220KJ. To me it looks like the ▲H = reactants - products. Anyways, for this particular problem there's something i'm not seeing... please help!! Thanks