Question

Mole fraction of the solute in a 0.5 molal aqueous
solution is
(1) 1/112
(2)1/55
(3)5/18
(4)1/56
​

Answer 1

Answer:

Mole fraction of solute= 0.5/0.5+5.5

0.5 /6=1/12

Explanation:

Answer 2

Concept:

Mole fraction of solute is defined as the number of moles of solute present by total number of moles of solution.

Given:

It is given that number of moles of solute is 0.5 molal aqueous solution.

To Find:

We have to find the mole fraction of solute in a 0.5 molal aqueous solution is.

Solution:

Mole fraction of aqueous solution is given by,

$(Mole fraction)_{solute} =\frac{no. of moles of solute}{total no. of moles in solution}$

0.5 molal aqueous solution=0.5 moles of solution present in 1000g of water.

if 18 g of water = 1 mole

then 1000 g of water = 1000/18= 55.55 moles

Mole fraction of solute = $\frac{0.5}{55.55+0.5} =\frac{0.5}{56.05}=0.0089$

Hence the mole fraction of solute in 0.5 molal aqueous solution is 0.0089

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