Problem: Which of the following has a non-zero ΔHf°?   a. O2 (l) b. C (graphite) c. N2 (g) d. F2 (g) e. Cl2 (g)

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Which of the following has a non-zero ΔHf°?

a. O2 (l)

b. C (graphite)

c. N2 (g)

d. F2 (g)

e. Cl2 (g)

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