What is 500 ppm expressed as mass percent?
Answer and explanation
Correct answer: 0.05 percent
For mass concentration units, 1 ppm means one part in 1,000,000, while 1% means one part in 100. Consequently, 1% = 10,000 ppm. Therefore, 500 ppm expressed as a percentage is 500 ÷ 10,000 = 0.05%. Equivalently, 500 × 10−6 × 100 = 0.05%. The other options shift the decimal point by factors of ten or one hundred.
Frequently asked questions
What is the correct answer to this question?
0.05 percent
Why is this the correct answer?
For mass concentration units, 1 ppm means one part in 1,000,000, while 1% means one part in 100. Consequently, 1% = 10,000 ppm. Therefore, 500 ppm expressed as a percentage is 500 ÷ 10,000 = 0.05%. Equivalently, 500 × 10−6 × 100 = 0.05%. The other options shift the decimal point by factors of ten or one hundred.
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.
