The mole fractions of glucose and water in aqueous glucose solution are 0.0244 and 0.9756 respectively. What is the weight percentage (w/w) of glucose in this solution?
Let's assume we have 1 mole of the total solution. Mole fraction of glucose is 0.0244 . This means there are 0.0244 moles of glucose in the solution. The mass of glucose is calculated by multiplying the number of moles by the molar mass of glucose ( 180.16g∕mol ): 0.0244×180.16=4.3959g The mole fraction of water is 0.9756 . This means there are 0.9756 moles of water in the solution. The mass of water is found by multiplying the number of moles by the molar mass of water ( 18.01g∕mol ): 0.9756×18.01=17.570g The total mass of the solution is just the mass of glucose plus the mass of water: 4.3959+17.570=21.9659g To find the weight percent (w∕w) of glucose, divide the mass of glucose by the total mass and multiply by 100 : ‌