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7. The following elemental analyses were found for K3 [Al(C204)3] sample: Before thorough drying (i.e. only surface moisture removed): C, 15.45%; H, 1.22%. After drying in the oven, C, 16.83%; H, 0.36%. Fill in the table below to calculate the number of water molecules before and after drying by considering all the possible hydrates of the complex. (0.5 marks) MW %C %H Compound K[Al(C204)3]3H20 K:[Al(C204)3]2H20 K3[Al(C204)3] H20 before thorough drying after thorough drying The implied formula of the air-dried compound is: and the formula of the thoroughly dried compound is: Explain your answer (1 mark): (0.5 marks) (0.5 marks)