Calculate the mass percent of Cl in Freon-112 (C₂Cl₄F₂), a CFC refrigerant.

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SORT You are given the molecular formula of Freon-112 and asked to find the mass percent of Cl. STRATEGIZE The molecular formula tells you that there are 4 mol of Cl in each mole of Freon-112. Find the mass percent composition from the chemi- cal formula by using the equation that defines mass percent. The conceptual plan shows you how to use the mass of Cl in 1 mol of C₂Cl4F₂ and the molar mass of C₂C14F2 to find the mass per- cent of Cl. GIVEN: C₂C14F₂ FIND: mass percent Cl CONCEPTUAL PLAN Mass % Cl = 4 x molar mass Cl molar mass C₂C14F2 RELATIONSHIPS USED Mass percent of element X = X 100% mass of element X in 1 mol of compound mass of 1 mol of compound X 100%