Can enthalpy of formation be negative or positive?

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Solution

Enthalpy of formation:
Enthalpy of formation of a substance is the enthalpy change that occurs when one mole of a substance is formed from its constituent elements in their standard states.
Enthalpy of formation can either be negative or positive.
When enthalpy of formation is negative it indicates that the formation of a compound is exothermic.
When enthalpy of formation is positive it indicates that the formation of a compound is endothermic.

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The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
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