Chemistry · Different methods for expressing the concentration of solution: molality, molarity, mole fraction, percentage (by volume and mass both)
What is the mole fraction of glucose in w/w glucose solution?
What is the mole fraction of glucose in \( 10 \% \) w/w glucose solution?
- A. 0.01
- B. 0.02
- C. 0.03
- D. 0.04
Step-by-step solution
In a 10% w/w glucose solution, 10 g of glucose and 90 g of water are present (per 100 g solution). Moles of glucose = 10 g / 180 g/mol = 0.0556 mol. Moles of water = 90 g / 18 g/mol = 5 mol. Total moles = 5.0556 mol. Mole fraction of glucose = 0.0556 / 5.0556 ≈ 0.0110, which rounds to 0.01.
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