A solution contains 18 g urea dissolved in 200 g water. What is the approximate mass percentage of urea?
Answer and explanation
Correct answer: 8.3 percent
The total solution mass is 18 + 200 = 218 g. Mass percent of urea = 18/218 × 100 = 8.256%, which rounds to approximately 8.3%. Thus, option B is correct. The value 9.0% would result from rough or incorrect calculation, while 18% wrongly treats the solute mass as the percentage itself.
Frequently asked questions
What is the correct answer to this question?
8.3 percent
Why is this the correct answer?
The total solution mass is 18 + 200 = 218 g. Mass percent of urea = 18/218 × 100 = 8.256%, which rounds to approximately 8.3%. Thus, option B is correct. The value 9.0% would result from rough or incorrect calculation, while 18% wrongly treats the solute mass as the percentage itself.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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