25 mL ethanol is mixed and final volume is made 200 mL. What is the volume percent of ethanol?
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Answer and explanation
Correct answer: 12.5 percent
Volume percent is calculated as (volume of solute ÷ final volume of solution) × 100. Here it is (25 mL/200 mL) × 100 = 12.5%. The final volume is specified, so it must be used in the denominator; simply comparing ethanol volume with an assumed solvent volume would not give the requested volume percentage.
Frequently asked questions
What is the correct answer to this question?
12.5 percent
Why is this the correct answer?
Volume percent is calculated as (volume of solute ÷ final volume of solution) × 100. Here it is (25 mL/200 mL) × 100 = 12.5%. The final volume is specified, so it must be used in the denominator; simply comparing ethanol volume with an assumed solvent volume would not give the requested volume percentage.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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