A solution contains 8 moles of solute and the mass of the solution is 4 kg. What’s the molality of this solution?(a) 5 mol/kg(b) 8 mol/kg(c) 4 mol/kg(d) 0.5 mol/kgI have been asked this question in exam.The doubt is from Stoichiometry and Stoichiometric Calculations in chapter Chemistry Basic Concepts of Chemistry – Class 11

A solution contains 8 moles of solute and the mass of the solution is

1.	A solution contains 8 moles of solute and the mass of the solution is 4 kg. What’s the molality of this solution?(a) 5 mol/kg(b) 8 mol/kg(c) 4 mol/kg(d) 0.5 mol/kgI have been asked this question in exam.The doubt is from Stoichiometry and Stoichiometric Calculations in chapter Chemistry Basic Concepts of Chemistry – Class 11
Answer» The correct option is (d) 0.5 mol/KG The BEST explanation: Molality of a solution is given y the FORMULA; molality = NUMBER of moles of the solute/mass of the solution. So here the number of moles is 8 and the mass of the solution is 4 kg. Molality is 8/4 = 0.5 mol/kg.

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