Question

A solution of glucose in water is equimolar. What is mole fraction of
glucose?

(A) 0.1
(B) 1.0
(C) 0.25
(D) 0.5

Answer 1

Option A - 0.1 moles is the mole fraction of glucose.

The mole fraction  (xₐ ) is defined as the amount of a constituent (moles) divided by the total amount of all constituents in a solution.

Explanation:

Mole fraction=Number of constituent ÷Total number of all constituents in the solution

Here in the given question

Mole fraction = No. of moles of solution÷No. of moles of glucose

Step 1 of 2

Molecular mass of Glucose = 180g/mole

Here glucose and water are equimolar i.e 50% each

thus,No. of moles of Glucose =  50/180​

=0.277 moles

Molecular mass of water = 18g/mole

No. of moles of water =50÷18​

=2.7 moles

Mole fraction =  No. of moles of Glucose÷No. of moles of glucose +No. of moles of water

=0.27÷2.7​

= 0.1 moles

Hence, option A is correct.