Question

Density of 5 molar aqueous
solution of urea is
1.3 g/ml at 298 K. the molality of solution is
(a) 5m
(c) 5.25m
(6) 4.5m
(d) 4.2m

plz answer with steps for solving​

Answer 1

Answer:

Explanation:4.2m

Answer 2

Answer:

Concept :

Molal concentration is another name for molality. It is a measurement of a solution's solute concentration. Solute and solvent are the two elements that make up the solution. The terms molarity, molality, normalcy, formality, volume percentage, weight percentage, and part per million are just a few of the various methods to indicate the concentration of a solution. Calculating the solvent's mass and the solute's molecular weight is required in the term.

Given :

At 298 K, the density of a 5 molar urea aqueous solution is 1.3 g/ml. the solution's molality is

(a) 5m

(c) 5.25m

(6) 4.5m

(d) 4.2m

Find :

finding the molality of a solution

Answer :  

The option answer is (a) 5m.

The urea aqueous solution's molarity, $M=5molar$

The density of urea in aqueous solution, ρ $= 1.3g/ml$

The solution's molality, m =?

As we know,

The urea molar mass, $M'=60.06g/mol$

The equation below can be used to determine the solution's molality in terms of a given density and molarity

$\frac{1}{m} =\frac{d}{M}-\frac{M'}{1000}$

We obtain: by entering the supplied values into the equation:

$\frac{1}{3}=\frac{1.3}{5}-\frac{60.06}{1000} \\\frac{1}{m} =0.26-0.06\\\frac{1}{m}=0.2$

$m=5m$

Hence, the molarity of the solution $=5m$

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