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How many mL of sulphuric acid of density...

How many mL of sulphuric acid of density `1.84gmL^-1` containing 95.6 mass % of `H_2SO_4` should be added to one litre are 40 mass% solution of `H_2SO_4` of density `1.31gmL^-1` in order to prepare 50 mass% solution of sulphuric acid of density `1.40gmL^-1`.

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