An impure sample of is analyzed using TGA technique. TG curve  of the sample indicates the total mass change from 85 mg to 30.7 mg when this sample was heated up to 1173 K. calculate the purity of the sample. 

To determine the purity of the sample, we need to understand the principles behind Thermogravimetric Analysis (TGA) and how it applies to the given compound, CaC2O4-H2O.

TGA measures changes in the mass of a sample as it is heated over a range of temperatures. In the case of CaC2O4-H2O, it undergoes decomposition when heated, leading to a loss in ___ ____ _________ _________ __________ __________ _________ ________.
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