Question

Mole fraction of glycerine $\left(C_3{H}_5\right(OH{)}_3)$ in a solution of 36 g of water and 46 g of glycerine is :

• A. $0.46$
• B. $0.36$
• C. $0.20$
• D. $0.40$

Answer 1

Answer: (C)

$0.20$

No. of moles of glycerine = 46/92 (where 92 is M.M. of glycerine)

= 0.5moles

No. of moles of water = 36/18 (where 18 is M.M. of water)

= 2moles

So, mole fraction oh glycerine = 0.5/2.5

= 1/5

= 0.20

Hence the correct option is C.