A solution contains X mL of ethyl alcohol mixed with 100 mL of water. The concentration of the solution is 28.6% in terms of volume by volume percentage. Find the approximate value of X.

20 mL

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40 mL

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30 mL

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50 mL

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Solution

The correct option is B 40 mL
Given:- Volume of ethyl alcohol (solute) = X mL
Volume of water (solvent) = 100 mL
Volume of solution = (100 + X) mL

Concentration in terms of volume by volume percentage = 28.6% = $\frac{v o l u m e o f s o l u t e}{v o l u m e o f s o l u t i o n} \times 100$
Using the above formula, we get the approximate value of X = 40 mL.

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