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A solution contains 8 moles of solute and the mass of the solution is 4 kg. What’s the molality of this solution?

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in Chemistry – Class 11 by (148k points)
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/kg

I have been asked this question in exam.

The doubt is from Stoichiometry and Stoichiometric Calculations in chapter Chemistry Basic Concepts of Chemistry – Class 11

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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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