Question

If the mole fraction of glucose in water is 0.050 for a particular solution, what is the molality of this solution?

A] 5.6 m
B] None of the listed answers are correct
C] 0.50 m
D] 0.34 m
E] 2.9 m

Answer 1

#72737 Chemistry, Other

If the mole fraction of glucose in water is 0.050 for a particular solution, what is the molality of this solution?

A] 5.6 m

B] None of the listed answers are correct

C] 0.50 m

D] 0.34 m

E] 2.9 m

Answer:

(XA x 1000)/ (XB x mol.wt. of B) = molality ‘m’

XB = 1 - XA

XB = mole fraction of water

(XA x 1000)/ (1 - XA) mol.wt. of B = molality ‘m’

XA = mole fraction of glucose

XA = 0.050

1 - XA = 1 - 0.05 = 0.95

m = 0.05 x 1000 / (0.95 x 18)

m = 2.92 mole/kg

Correct answer: E] 2.9 m.

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