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Which of the substances have a standard heat of formation ( δH∘f ) of zero?
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Which of the substances have a standard heat of formation ( δH∘f ) of zero?

User SMathew
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All elements in their standard states (oxygen gas, solid carbon in the form of graphite, etc.) have a standard enthalpy of formation of zero, as there is no change involved in their formation.
User Sqwerl
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