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Use these atomic masses Cr = 52.00 g/molO = 16.00 g/molMoles of Cr = 52 g / 52.00 g/mol = 1.000 mol CrMoles of O = 48 g / 16.00 g/mol = 3.000 mol O1 / 1 = 1 Cr : 3 / 1 = 3 OThe empirical formula is CrO3, also known as chromium (III) oxide. Is the name correct? Check.
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