Single Choice

3 g of salt having molecular weight 30 is dissolved in 250 g of water. The molality of the solution is:

A$$0.4$$
Correct Answer
B$$0.2$$
C$$0.6$$
D$$0.8$$

Solution

$$Molality = \dfrac{\text{moles of solute}}{\text{mass of solvent (in Kg)}}$$

$$\Rightarrow\text{ moles of solute} =\dfrac{3}{30}=\dfrac{1}{10}$$

$$Molality =\dfrac{1}{10}\times \dfrac{1000}{250}$$

$$\Rightarrow 0.4 m$$

SIMILAR QUESTIONS

Mole Concept

Number of moles of solute dissolved in 1000 gm of the solvent is called:

Mole Concept

In which mode of expression, the concentration of a solution remains independent of temperature?

Mole Concept

The density of $$1$$ M solution of $$NaCl$$ is $$1.0585\:g\:ml^{-1}$$. The molality of the solution is :

Mole Concept

If $$20\:mL$$ of ethanol (density$$=\,0.7893\:g/mL$$) is mixed with $$40\:mL$$ water (density$$=\,0.9971\:g/mL$$) at $$25^{\circ}C$$, the final solution has density of $$0.9571\:g/mL$$. Calculate the molality of alcohol in the final solution. (as nearest integer)

Mole Concept

What is the concentration of a solution of 2,000 grams of water in which 684 grams of sucrose, $$\displaystyle { C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 }$$ is dissolved?

Mole Concept

3.42g of a substance of molecular weight 342, is present in 250g of water. Molality of this solution is:

Mole Concept

A compound H$$_2$$X with molar weight of 80g is dissolved in a solvent having density of 0.4 gml$$^{-1}$$. Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is:

Mole Concept

The mole fraction of urea in aqueous urea containing $$900\ g$$ of water is $$0.05$$. If the density of the solution is $$1.2\ g/cm^3$$, the molarity of urea solution is ______.

Mole Concept

The molality of the solution containing 15.20 g of urea (molar mass = 60) dissolved in 150 g of water is:

Mole Concept

An aqueous solution of urea containing 18g urea in 1500 cm$$^3$$ of the solution has a density equal to 1.052. If the molecular weight of urea is 60, the molality of the solution is:

Contact Details