# 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. What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.

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