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Stoichiometry

Q1: A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is

A 2

B 1

C 0.5

D 0.5

ANS:C - 0.5

Molality (𝑚m) is defined as the number of moles of solute dissolved in 1 kilogram of solvent. Given:

  • Number of moles of solute = 1 kilomole
  • Mass of solvent = 2000 kg
We can use the formula for molality: 𝑚=Number of moles of soluteMass of solvent in kgm=Mass of solvent in kgNumber of moles of solute​ 𝑚=1 kmol2000 kgm=2000kg1kmol​ 𝑚=0.5 mol/kgm=0.5mol/kg Therefore, the molality of the solution is 0.5 mol/kg. So, the correct option is 0.5.



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