Question

"For which of the following equations is the value of delta H equivalent to the bond enthalpy for the carbon-oxygen bond in carbon monoxide?

A. CO(g)-> C(g) + O(g)
B. CO(g)-> C(s) + O(g)
C. CO(g)-> C(s) + 1/2 O2(g)
d. CO(g)-> C(g) + 1/2 O2 (g)"

I'm guessing that the answer is A? Am I right?

Answer 1

I would go with A also.
C(g) delta H = 715.7 kJ/mol
O(g) delta H = 259.2 kJ/mol
total is 1065.9 and the average for a Ctriple bondO is 1070 kJ/mol.
See the definition here.
http://www.webchem.net/notes/how_far/enthalpy/enthalpy_diagrams.htm

Answer 2

No, it C
BECAUSE THE ELEMENTS NEED TO BE IN THE MOS ESTABLE STATE
C(S) AND O2(G)