Which of the reactions defines the heat of formation ?

\(\frac{1}{2} H_{2(g)} + \frac{1}{2} Cl_{2(g)} \rightarrow HCl_{(g)}\)

\(N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}\)

\(2H_{2(g)} + O_{2(g)} \rightarrow 2H_2O_{(l)}\)

\(C_{(Diamond)} + O_{2(g)} \rightarrow CO_{2(g)}\)

\(\frac{1}{2} H_{2(g)} + \frac{1}{2} Cl_{2(g)} \rightarrow HCl_{(g)}\)

\(\frac{1}{2} H_{2(g)} + \frac{1}{2} Cl_{2(g)} \rightarrow HCl_{(g)}\)

Chemical Thermodynamics Quiz 3

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