Multiple choice

If 138 g of ethyl alcohol is mixed with 72 g of water, the ratio of mole fraction of alcohol to water is

  1. 3 : 4

  2. 1 : 2

  3. 1 : 4

  4. 1 : 1
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A Correct answer
Explanation

Moles of alcohol (C2H5OH, MW=46) = 138/46 = 3. Moles of water (H2O, MW=18) = 72/18 = 4. Mole fraction ratio = Moles of alcohol / Moles of water = 3/4.

AI explanation

To find the mole fraction ratio, divide the mass of each component by its molar mass. The moles of ethyl alcohol are 138 divided by 46, resulting in 3 moles, and the moles of water are 72 divided by 18, resulting in 4 moles. The ratio of the mole fraction of alcohol to water is therefore 3 to 4.

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