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(x-y)g of Al2(SO4)3 dissolved in 500cm^3 portion of a solution at 23°C to obtain a solubility of 2mol/dm^3. Also, (2x-y)g of acidified K2SO4 dissolved in 1000cm^3 portion of the solution in 78°C to obtain a solubility of 4mol/dm^3. Determine the value of (x+y)g. (Al=27, S=32, K=39, O=16, H=1).

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