Standard Heats and Free Energies of Formation and Absolute Entropies of Elements and Inorganic Compounds To determine which form is zero, the more stable form of carbon is chosen. Table 1 provides sample values of standard enthalpies of formation of various compounds. The enthalpy difference between graphite and diamond is too large for both to have a standard enthalpy of formation of zero.

The term standard state is used to describe a reference state for substances, and is a help …

The standard enthalpy of formation, or standard heat of formation, of a compound is the change in enthalpy that accompanies the formation of one mole of the compound from its elements in their standard states. Standard Enthalpy of Formation* for Various Compounds ... * All standard enthalpy values are at 25°C and 1 atmosphere of pressure. This is also the form with the lowest enthalpy, so graphite has a standard enthalpy of formation equal to zero. To understand standard enthalpy of formation of O2 Equal to Zero, you need to understand the definition of standard enthalpy of formation.This is the change of enthalpy when one mole of a substance in its standard state is formed from its elements under standard state conditions of 1 atmosphere pressure and 298K temperature.

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