Step 1: The atomic masses are 12.01 g/mol C, 1.01 g/mol H, and 35.45 g/mol Cl.
A 2.144-g sample of phosgene, a compound used as a chemical warfare agent during World War I, contains 0.260 g of carbon, 0.347 g of oxygen, and 1.537 g of chlorine. What is the empirical formula of this substance?
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