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please show full working on how to get the answer step by step. A 12% solution of an unknown substance is isotonic with a 6%w/w

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A 12% solution of an unknown substance is isotonic with a 6%w/w sorbitol (MW = 182g/mol ) solution. What is its approximate molecular weight assuming it does not dissociate (i=1) ? Hint: Try writing an equation which relates the two osmotic pressures. Select one: 60gmol1 230gmol1 91gmol1 364gmol1 546gmol1 4.6gmol1 18gmol1

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