MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistrySolutionsGeneral

The mole fraction of C₂H₅OH (Mol. wt. = 46) in 5 molal aqueous ethyl alcohol solution is

A.0.082✓ Correct

B.0.82

C.5

D.8.2

Explanation

5 moles solution of 2 5 C H OH contains 5 moles of 2 5 C H OH in 1kg of water We know that 1kg of water contains 55.5 moles of water. Then mole fraction of ethanol is, 2 5 5 Mole fraction of C H OH 5 55.5 Therefore, 2 5 0.082 C H OH X

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