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Unformatted text preview: by the scales. Then it is possible the unknown was heated to a point, where it can start to evaporate. 5. a)Constant weight is essentially achieved when the sample is heated and weighed in successing heatings until the weight differs by no more than 0.05 g. 3.07g-0.05g= 3.02g. b)% H2O= mass lost/ mass of sample x 100% 1.8053/4.8702 x 100%= 37.07%...
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