객관식
What is the molality of a solution prepared by dissolving 12.5 g of KNO3 in 75.0 g of H2O?
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14. Solutions
Molality
Multiple Choice
In general chemistry, molality is defined as moles of solute per kilogram of solvent. What are the correct units of molality?
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검증된 단계별 안내1
Recall the definition of molality: it is the number of moles of solute divided by the mass of the solvent in kilograms.
Write the formula for molality as \(\text{molality} = \frac{\text{moles of solute}}{\text{kilograms of solvent}}\).
Identify the units for moles of solute, which is 'mol', and for the mass of solvent, which is 'kg'.
Combine these units to express molality units as \(\frac{\text{mol}}{\text{kg}}\).
Compare this with the given options to select the one that matches \(\frac{\text{mol}}{\text{kg}}\) as the correct unit for molality.
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