You have a mixture of oxalic acid, H₂C₂O₄, and another solid that does not react with sodium hydroxide. If 29.58 mL of 0.550 M NaOH is required to titrate the oxalic acid in the 4.554-g sample to the second equivalence point, what is the mass percent of oxalic acid in the mixture? Oxalic acid and NaOH react according to the equation

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H₂C₂O4(aq) + 2 NaOH(aq) Na₂C₂O4(aq) + 2 H₂O(l)