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Thermogravimetric analysis (TGA) is a widely used technique in electro-analytical and other analytical methods for determining the composition and purity of compounds by monitoring mass changes as a function of temperature. In the given problem, an impure sample of calcium oxalate monohydrate, CaC₂O₄·H₂O, is analyzed using TGA to calculate its purity. The mass of the sample decreases from 85 mg to 30.7 mg upon heating to 900°C, reflecting the thermal decomposition of the compound. Calcium oxalate monohydrate undergoes characteristic decomposition on heating. First, it loses water to form anhydrous calcium oxalate, followed by decomposition to ________ _______ _____ _________ ___ ____ ________ _____ _____.
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