Question

Mole fraction of water in an aqueous solution of 10% glucose is (Molar mass of glucose is 180 g/mol)​

Answer 1

10% w/w solution of glucose in water means that 10 g of glucose is present in 100 g of the solution i.e., 10 g of glucose is present in (100−10)g=90 g of water.

Molar mass of glucose (C

6

H

12

O

6

) =6×12+12×1+6×16=180 gmol

−1

Then, number of moles of glucose =

180

10

mol

=0.056 mol

Number of moles of water =

18

90

mol

−1

=5 mol

Mole fraction of glucose (X)=

(0.056+5)

0.056

=0.011

Hence, the correct option is B