객관식
What is the molality of lithium ions in a 0.302 m solution of Li\(_3\)PO\(_4\), assuming the compound dissociates completely?
38
views
14. Solutions
Molality
객관식
In solution chemistry, molality is defined as the amount of solute per mass of solvent. What are the correct units of molality?
A
(moles of solute per kilogram of solvent)
B
(moles of solute per liter of solution)
C
(grams of solute per liter of solution)
D
(moles of solute per gram of solution)
검증된 단계별 안내1
Recall the definition of molality: it is the amount of solute (in moles) divided by the mass of the solvent (in kilograms).
Express molality mathematically as \(\text{molality} = \frac{\text{moles of solute}}{\text{mass of solvent in kg}}\).
Identify the units for moles of solute as 'mol' and the units for mass of solvent as 'kg'.
Combine these units to write the units of molality as \(\frac{\text{mol}}{\text{kg}}\).
Understand that molality differs from molarity, which uses volume of solution (liters) in the denominator, so molality's correct units are moles per kilogram of solvent.
관련 영상
관련 실천
