How much of the following have their standard heat of formation zero at

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

How much of the following have their standard heat of formation zero at 298K298\text{K} . O2(l)\text{O}_2(l) , Cgraphite\text{C}_{\text{graphite}} , PBlack\text{P}_{\text{Black}} , Smonoclinic\text{S}_{\text{monoclinic}} , I2(solid)\text{I}_2(\text{solid})

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