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When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula for this compound? A. HfCl B. HfCl2 C. HfCl3 D. HfCl4 E. Hf2Cl3

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