Which of the following reactions defines ∆Hº f ? (2003)

Chemistry · JEE Advanced · NTA Exams — Chemical Thermodynamics

Which of the following reactions defines ∆Hº_f ? (2003)

C_(diamond)+ O₂(g) → CO₂ (g)
\(\frac{1}{2} \mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{~F}_{2}(\mathrm{~g}) \rightarrow \mathrm{HF}(\mathrm{~g})\)
N₂ (g) + 3H₂ (g) → 2NH₃(g)
\(\mathrm{CO}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})\)

Answer

(B) 1 2 H _ 2 ( ~g )+ 1 2 ~F _ 2 ( ~g ) HF ( ~g )

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