Question:
What are the mole fractions of glucose and water respectively, in 20% (w/w) aqueous glucose solution?
(\(C = 12\,u\); \(O = 16\,u\); \(H = 1\,u\))
What are the mole fractions of glucose and water respectively, in 20% (w/w) aqueous glucose solution?
(\(C = 12\,u\); \(O = 16\,u\); \(H = 1\,u\))
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Calculate mole fractions by converting masses to moles and dividing by total moles.
Updated On: Jan 6, 2026
- 0.0244, 0.9756
- 0.04, 0.96
- 0.0636, 0.9364
- 0.0124, 0.9876
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The Correct Option is A
Solution and Explanation
- Assume 100 g solution:
Glucose = 20 g, Water = 80 g.
- Moles of glucose: \[ \frac{20}{180} = 0.111 \]
- Moles of water: \[ \frac{80}{18} = 4.44 \] - Total moles = \(0.111 + 4.44 = 4.551\) Mole fractions: \[ x_{{glucose}} = \frac{0.111}{4.551} = 0.0244 \] \[ x_{{water}} = \frac{4.44}{4.551} = 0.9756 \]
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