For which of the following substances

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

For which of the following substances, the standard heat of formation is zero ? (A) C(graphite)C_{(\text{graphite})} (B) C(diamond)C_{(\text{diamond})} (C) CO2\text{CO}_2 (D) O3\text{O}_3

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