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{"ops":[{"insert":"A fertiliser contains ammonium iron (II) sulphate, FeSO4.(NH4)2SO4.6H2O as a source of \niron. \nA 6.50 g sample of this fertiliser is made up to 250 mL with dilute sulphuric acid. 25 mL of \nthis solution is reacted with 23.5 mL of 0.01 mol L-1 potassium dichromate (K2Cr2O7) \nsolution as shown by the balanced equation below\n(i) Calculate the moles of Cr2O72+ ions that has reacted.\n(ii) Determine the moles of Fe2+ ions that has reacted.\n(iii) Calculate the mass of Fe in the 25 mL aliquot (M(Fe) = 56 g mol-1))\n(iv) Determine the total mass of Fe present in the 6.50 g sample of fertiliser\n(v) Calculate the percentage of Fe in the fertiliser.\n"}]}
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