Mole Fraction
In a solution of ethanol (moles 2.0) and water (moles 8.0), mole fraction of ethanol is:
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About This Question
- Subject
- chemistry
- Chapter
- solutions
- Topic
- mole fraction
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
0.20
- Formula: Mole fraction of a component i (Xi) is given by Xi=∑nni, where n is the number of moles.
- Given Data:
- Moles of Ethanol (neth) = 2.0
- Moles of Water (nwat) = 8.0
- Total Moles: ntotal=neth+nwat=2.0+8.0=10.0 moles.
- Calculation: Xeth=10.02.0=0.20.
- Verification: The sum of mole fractions must be 1. Xwat=10.08.0=0.80, and 0.20+0.80=1.0.
This easy difficulty chemistry question is from the chapter solutions, covering the topic of mole fraction. It appeared in the 2025 exam.
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