Question

a solution of glucose in water is labelled as 10% mass by mass percentage what would be molarity and mole fraction of each component in the solution if the density of solution is 1.2 gram per mole what will be the molarity of the solution​

Answer 1

Answer:

10% by mass means 10g solute in 90g water.

Molar mass of glucose = 180 g

So no of moles (Glucose) = 10/180 = 0.05 moles

No of moles of water = 90/18 = 5 moles

Mole fraction of solute = 0.05/5+0.05

-> 0.05/5.05 = 0.01

Mole fraction of solvent = 1 - 0.01 = 0.99

Molarity = no of moles / vol of Soln (Litres)

Vol = mass / density

-> 90 / 1.2 = 75ml

75ml = 0.075L

Molarity = 0.05 / 0.075 = 0.67M