An unknown substance is a white solid at room temperature and has a melting point of 78 °C. Which of the following substances is most likely to be the identity of the unknown sample?
A. Naphthalene, a molecular solid with the formula C₁₀H₈ (C10H8)
B. Silica, a network solid held together by covalent bonds with the formula SiO₂
C. Calcium chloride, an ionic compound with the formula CaCI₂
D. Water, an molecular compound with the formula H₂O
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WATER AN MOLECULAR COMPOUND WITH THE FORMULA H²O
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