Elements in their standard state are not formed, they just are. The standard enthalpy of reaction occurs in a system when one mole of matter is transformed by a chemical reaction. You need to know the values of the heat of formation to calculate enthalpy, as well as for other thermochemistry problems. So, ΔH° f for C (s, graphite) is zero, but the ΔH° f for C (s, diamond) is 2 kJ/mol. The standard enthalpy of formation for an element in its standard state is ZERO!!!! Also, called standard enthalpy of formation, the molar heat of formation of a compound (ΔH f) is equal to its enthalpy change (ΔH) when one mole of a compound is formed at 25 degrees Celsius and one atom from elements in their stable form. The standard enthalpy of formation of any element in its standard state is zero by definition. The standard enthalpy of formation is the change in enthalpy that accompanies the formation of one mole of the compound from its elements. The term standard state is used to describe a reference state for substances, and is a help … The standard enthalpy of formation of any element in its most stable form is zero by definition. For example, although oxygen can exist as ozone (O 3), atomic oxygen (O), and molecular oxygen (O 2), O 2 is the most stable form at 1 atm pressure and 25°C. The standard enthalpy of formation is defined as the enthalpy change when 1 mole of compound is formed from its elements under standard conditions. Key Terms. That is because graphite is the standard state for carbon, not diamond. The standard enthalpy of formation is a measure of the energy released or consumed when one mole of a substance is created under standard conditions from its pure elements. The symbol of the standard enthalpy of formation is ΔH f. Δ = A change in enthalpy; o = …


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