Q.

0.1 gram mole of urea is dissolved in 100g of water. The molality of the solution is

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a

0.1 m

b

0.01 m

c

0.001 m

d

1.0 m

answer is D.

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Detailed Solution

Number of moles of Urea, n=0.1grammol

Weight of solvent,Wsolvent=100 g

  1000g=1kg  

 100g=1kg1000g×100g=0.1kg

From molality equation,

       m=nW in kg

Explanation:

Molality (m) = (Number of moles of solute) / (Mass of solvent in kilograms)

Given:

  • Number of moles of urea (solute): 0.1 mol
  • Mass of water (solvent): 100 g = 0.1 kg

Applying the values:

1 mol/kg
0.1 / 0.1=1

Therefore, the molality of the solution is 1 mol/kg.

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0.1 gram mole of urea is dissolved in 100g of water. The molality of the solution is