Multiple choice

A mixture has 18 g water and 414 g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture) :

  1. 0.1

  2. 0.4

  3. 0.7

  4. 0.9
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A Correct answer
Explanation

Moles of water = 18g / 18g/mol = 1 mol. Moles of ethanol = 414g / 46g/mol = 9 mol. Total moles = 1 + 9 = 10. Mole fraction of water = 1 / 10 = 0.1.

AI explanation

We calculate the moles of water as 18 / 18 = 1 mole, and the moles of ethanol as 414 / 46 = 9 moles. The mole fraction of water is the moles of water divided by the total moles in the mixture. Thus, 1 / (1 + 9) equals 0.1.

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