1.

Which of the following reactions represents DeltaH_f^@

Answer»

`C_(("diamond")) + O_(2(g)) rarr CO_(2(g))`
`1/2H_(2(g)) + 1/2 F_(2(g)) rarr HF_((g))`
`N_(2(g)) + 3H_(2(g)) rarr 2NH_(3(g))`
`CO_((g)) + 1/2O_(2(g)) rarr CO_(2(g))`

Answer :B


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