The zirconium oxalate K₂Zr(C₂O₄)₃ (H₂C₂O₄) . H₂O
was synthesized by mixing 1.68 g of ZrOCl₂ . 8H₂O with 5.20 g of H₂C₂O₄ . 2H₂O and an excess of aqueous KOH. After 2 months, 1.25 g of crystalline product was obtained, along with aqueous KCl and water. Calculate the percent yield.