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.
Frequently asked questions
What is the correct answer to this question?
21.1 percent
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
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