another topscore GC question

[SayitIsntSO]

I thought when you are finding the change in enthalpy for a rxn you go: pdt-reactants? I am confused by the topscore solution in which you gotta find the change in enthalpy for: 2C(s)+O2(g)---> 2CO (g). I would try to rewrite the question, but it's too hard. For anyone who has topscore, i think you know this question. It is on test 2 for genchem, I think question 57 (gchem 17). I would really appreciate the help.

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[dat_student]

I thought when you are finding the change in enthalpy for a rxn you go: pdt-reactants? I am confused by the topscore solution in which you gotta find the change in enthalpy for: 2C(s)+O2(g)---> 2CO (g). I would try to rewrite the question, but it's too hard. For anyone who has topscore, i think you know this question. It is on test 2 for genchem, I think question 57 (gchem 17). I would really appreciate the help.

If you post the question I may be able to help I don't have TOPSCORE

 

[Pdiddy310]

I thought when you are finding the change in enthalpy for a rxn you go: pdt-reactants? I am confused by the topscore solution in which you gotta find the change in enthalpy for: 2C(s)+O2(g)---> 2CO (g). I would try to rewrite the question, but it's too hard. For anyone who has topscore, i think you know this question. It is on test 2 for genchem, I think question 57 (gchem 17). I would really appreciate the help.

I could be wrong b/c it's been several years since I've taken gen chem but...

If I remember correctly, the heat of formation of elements in standard state is 0. Depending on whether or not the C(s) is diamond or graphite in this question, you will get a different answer.

The equation should look like this:

[2 x enthalpy of CO] - [2 x enthalpy of C(s) + 0]

 

[R.L.H]

I could be wrong b/c it's been several years since I've taken gen chem but...

If I remember correctly, the heat of formation of elements in standard state is 0. Depending on whether or not the C(s) is diamond or graphite in this question, you will get a different answer.

The equation should look like this:

[2 x enthalpy of CO] - [2 x enthalpy of C(s) + 0]

i think you are right, b/c the heat of formation of elements in standard state (O2 (g) in this case) is 0.

 

[dontbam]

I thought when you are finding the change in enthalpy for a rxn you go: pdt-reactants? I am confused by the topscore solution in which you gotta find the change in enthalpy for: 2C(s)+O2(g)---> 2CO (g). I would try to rewrite the question, but it's too hard. For anyone who has topscore, i think you know this question. It is on test 2 for genchem, I think question 57 (gchem 17). I would really appreciate the help.

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