WBCS.LIVE practice question

What is the percentage of Calcium in Calcium Carbonate?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 50
  2. 10
  3. 40
  4. 100

Correct answer and explanation

Correct answer: 40

Explanation: āœ… Correct Answer: C) 40 šŸ“š Explanation: To find the percentage of Calcium in Calcium Carbonate (CaCO3), we look at the atomic masses: Ca=40, C=12, and O=16. The total molecular weight is (40 + 12 + 48) = 100. Since the mass of Calcium is 40 out of a total mass of 100, it makes up exactly 40 percent of the compound. This calculation is a basic example of percentage composition in chemistry.