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20 mL ethanol and 80 mL water are mixed. If the final volume is 95 mL, what is the volume percent of ethanol?

Answer and explanation

Correct answer: 21.1 percent

Volume percent is calculated using the volume of the component divided by the final volume of the solution, multiplied by 100. Thus ethanol volume percent = (20 mL/95 mL) × 100 = 21.05%, which rounds to 21.1%. The initial total of 100 mL is not used because the final volume is 95 mL after contraction.

Related tags

Volume PercentEthanolSolution ContractionMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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