객관식
What is the molality of a 10.5% by mass glucose (C₆H₁₂O₆) solution, given that the density of the solution is 1.03 g/mL?
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14. Solutions
Molality
Multiple Choice
Which of the following represents the correct units for molality?
A
g/L
B
mol/kg
C
mol/L
D
mol/mL
검증된 단계별 안내1
Understand that molality is a concentration unit that expresses the amount of solute (in moles) per mass of solvent (in kilograms).
Recall the definition of molality: \(m = \frac{\text{moles of solute}}{\text{kilograms of solvent}}\).
Identify the units involved: moles (mol) for the solute and kilograms (kg) for the solvent.
Compare the given options to the definition: molality must have units of mol/kg.
Conclude that the correct units for molality are \(\text{mol/kg}\), distinguishing it from molarity which uses volume units like L or mL.
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