Formation Reactions

Ca(s) + C(graphite) + (3/2)O2(g) ---> CaCO3(s) DHof = -1207 kJ/mol

(1/2)H2(g) + (1/2)I2(g) ---> HI(g) DHof = 25.94 kJ/mol

DHorxn = S(DHof products) - S(DHof reactants)

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