A 24.63 gram sample of cobalt is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 31.32 g. Determine the empirical formula of the metal oxide.

Explanation:

Moles of Co = 24.63 / 58.9 = 0.418

Moles of O = (31.32 - 24.63) / 16 = 0.418

Since the mole ratio is 1 : 1, the empirical formula is CoO.

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