A herbicide contains 2,4-D (2,4-dichlorophenoxyacetic acid), C₈H₆Cl₂O₃. A 1.236-g sample of the herbicide was decomposed to liberate the chlorine as Cl⁻ ion. This was precipitated as AgCl, with a mass of 0.1840 g. What is the mass percent of 2,4-D in the sample?

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H. H C C. OCH₂CO₂H C. C C. CL H CL 2,4-D (2,4-dichlorophenoxyacetic acid)