Question

A solution of glucose in water is labelled as 10percentw/w , what would be the molality and mole fraction of each component in the solution? If the density of the solution is 1.2gmL-1 , then what shall be the molarity of the solution? Select the correct answer from above options

Answer 1

Correct Answer - 0.67M Let us suppose that the mass of solution is 100g Since solution is 10% glucose , therefore the mass of solvent is 100-10=90g Molar mass of glucose, C6H12O6=72+12+96 =180gmol m= W2×1000 Mw2×W1 = 10×1000 180×90 =0.617m Moles of water= 90 18 =5 Moles of glucose = 10 180 =0.055mol Mole fraction of glucose (CHMi2)= 0.055 5+0.55 =0.01 Mole fraction of water (CHMi1)=1-0.01=0.99 Vsol= Wsol dsol = 100 1.2 =83.33mL M= W2×1000 Mw2×VsolinmL = n2×1000 VsolinmL = 0.055×1000 83.33 =0.67M