Question

In D-glucose find molality of Glucose if mass % is 10.8% and weight of solution is 250g.

(a) 0.6 m

(b) 0.06 m

(c) 6 m

(d) 2.5 m

Answer 1

Correct option is (a) 0.6 m

Weight of solution = 250 g

Mass% = 10.8%

Mass of glucose/Mass of solution x 100 = 10.8

Mass of glucose = 10.8/100 x 250 = 27 g

Molality = Mass of glucose/Molar mass of glucose x 1000/wt. of solution

= 27/180 x 1000/250 = 0.6 m