Freezing Point Depression
A solution of urea (molar mass = 60 g/mol) in water freezes at −0.372°C. If Kf for water is 1.86 K kg mol⁻¹, the molality of the solution is:
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- freezing point depression
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
0.2 m
The depression of freezing point is given by: ΔTf=Kf×m
- Given:
- Freezing point of solution =−0.372∘C.
- Therefore, ΔTf=0−(−0.372)=0.372 K.
- Kf=1.86 K kg mol−1.
- Calculation:
- m=KfΔTf=1.860.372=0.2 m.
This easy difficulty chemistry question is from the chapter solutions, covering the topic of freezing point depression. It appeared in the 2025 exam.
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