C2H6 has a heat formation equal to zero at 25°c
Heat of formation or standard heat of formation and can also be called enthalpy of formation refer to the total t amount of heat that is either absorbed or evolved when one mole of a compound is formed from elements where each substance is present in it's normal physical state (gas, liquid, or solid).
Therefore, C2H6 has a heat formation equal to zero at 25°c because it's a carbon constituents and carbon has zero standard heat of formation.
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