Question

Maltose is converted to 'A' by Maltase.
The mole fraction of ‘A’in 10% (w/w) aq.
solution is approximately:​

Answer 1

Explanation:

10% w/w solution of glucose in water means that 10 g of glucose in 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=180gmol

−1

Then, number of moles of glucose = 10 / 180 mol

= 0.056 mol

x

w

=molefractionofA

Molality of solution = 0.056 mol / 0.09kg = 0.62 m

Number of moles of water = 90g / 18g mol-1 = 5 mol

Mole fraction of glucose (x

g

) = 0.056 / ( 0.056+5) = 0.011

And, mole fraction of water x

w

= 1 - x

g

= 1 - 0.011 = 0.989