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Answer:
% ethanol (v/v) = volume of solute/
volume of solution x 100
% ethanol = 35ml/150ml x 100
= 23.33%
Why 150ml instead of 115ml?
115ml of water is a solvent. To solve the problem we need the volume of solution.
How to find solution?
SOLUTION = SOLUTE + SOLVENT
So in this case, Solution = ethanol + water
SOLUTION = 35ml + 115ml = 150ml
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