__________ (Molarity/Molality) is the number of moles of solute dissolved per kg of solvent.

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Solution

The molality of a solution is the number of moles of solute dissolved in 1 Kg of the solvent. The unit of molarity is $m o l k g^{- 1}$ .
Thus, if one gram molecule of a solute is present in 1 kg of the solvent, the concentration of a solution is said to be one molal.
So, the correct answer is Molality.

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Q. Molality is the number of moles of solute dissolved per kg of solvent.

A scene in a fantasy chemistry lab.
Faraday was measuring the concentration of different solutes in different solutions. But he forgot the exact formula for Molarity, Molality and Normality. He decides to ask his colleagues.

Davy: ''Molarity is the number of moles of solute dissolved in 1 litre of solvent.''
Boyle: ''Molality is the number of moles of solute dissolved in 1 kg of solvent.''
Cavendish: ''Normality is the number of equivalents of solute dissolved in 1 litre of solution.''

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Can the Molarity and molality of a given solution (solute + solvent) be equal?

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__________ (Molarity/Molality) is the number of moles of solute dissolved per kg of solvent.

The molality of a solution is the number of moles of solute dissolved in 1 Kg of the solvent. The unit of molarity is molkg−1.Thus, if one gram molecule of a solute is present in 1 kg of the solvent, the concentration of a solution is said to be one molal.So, the correct answer is Molality.