The standard molar enthalpy of formation for aluminum oxide (al2o3) based on the thermochemical equations provided is −1676kJ.
The standard molar enthalpy of formation of a compound is defined as the enthalpy of formation of 1.0 mol of the pure compound in its stable state from the pure elements in their stable states at P = 1.0 bar at constant temperature.
Iis defined as the entropy or degree of randomness of one mole of a sample under standard state conditions.
The standard enthalpy of formation of any element in its standard state is zero by definition.
For example, although oxygen can exist as ozone (O₃), atomic oxygen (O), and molecular oxygen (O₂), O₂ is the most stable form at 1 atm pressure and 25°C.
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