If 0.05\,{g} of urea is dissolved in 5\,{g} of water, then

Correct Answer is : its molality will be greater than molarity

its molarity will be greater than molality

its molality will be greater than molarity

molarity and molality will be same

If 0.05\,{g} of urea is dissolved in 5\,{g} of water, then

Correct Answer is : its molality will be greater than molarity

Test Index

CGPET 2018 Solved Paper

Section: Chemistry

Question : 68 of 150

Marks: +1, -0

0.05\,\mathrm{g}

of urea is dissolved in

5\,\mathrm{g}

of water, then

its molarity will be greater than molality
its molality will be greater than molarity
molarity and molality will be same
its normality will be $\frac{50}{60}$

Validate

Solution:

Molarity

\frac{\text{number of moles of solute}}{\text{volume of solution (in L)}}

and molality

\frac{\text{number of moles of solute}}{\text{mass of solvent (in kg)}}

\because

Mass of solute (urea) and solvent (water) remain unchanged, during the calculations of molarity and molality. Thus, volume of solution contain less water molecules.

(\because

In case of volume of solution, it has both solute and solvent).

Thus, molality will be greater than that of molarity.

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