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Class 11ChemistrySome Basic Concepts of ChemistryMole concept and molar massEasy
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How many moles of solute are needed in 400 g solvent to make a 2.5 molal solution?

Answer and explanation

Correct answer: 1.0 mole

Molality is the number of moles of solute per kilogram of solvent, not per litre of solution. Convert 400 g solvent to 0.400 kg. Required moles = molality × solvent mass = 2.5 mol kg−1 × 0.400 kg = 1.0 mol. Therefore, option A is correct. The value 2.5 would apply to 1 kg solvent, while 0.4 is only the converted solvent mass.

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MolalitySolute-MolesConcentration-MetricsMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq
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