Problem: Consider the following reactions: 1.   2Al(s) + 3/2 O2 (g) → Al2O3 (s)        ΔH° = -1669.8 kJ/mol   2.   H2 (g) + 1/2 O2 (g) →  H2O (l)         ΔH° =    -285.8 kJ/mol 3.   H2O (s) → H2O (l)                           ΔH° =       6.01 kJ/mol For which, if any, reactions does ΔH° correspond to a molar enthalpy of formation?    Write the oxidation numbers in the spaces provided.    

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Consider the following reactions:

1.   2Al(s) + 3/2 O2 (g) → Al2O3 (s)        ΔH° = -1669.8 kJ/mol  

2.   H2 (g) + 1/2 O2 (g) →  H2O (l)         ΔH° =    -285.8 kJ/mol

3.   H2O (s) → H2O (l)                           ΔH° =       6.01 kJ/mol

For which, if any, reactions does ΔH° correspond to a molar enthalpy of formation? 

Write the oxidation numbers in the spaces provided.

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