What is the mass percentage of carbon (C) in methane (CH4)? (The molar mass of...
CHEMISTRY
JAMB 2023
What is the mass percentage of carbon (C) in methane (CH4)? (The molar mass of carbon is approximately 12 g/mol.)
- A. 25%
- B. 12%
- C. 75%
- D. 50%
Correct Answer: C. 75%
Explanation
The molar mass of methane (CH4) is calculated by adding the atomic masses of carbon (approximately 12 g/mol) and hydrogen (approximately 1 g/mol). Therefore, the molar mass of CH4 is 12 g/mol + 4 x 1 g/mol = 16 g/mol. The mass percentage of carbon in CH4 is given by (mass of carbon / total mass) x 100% = (12 g / 16 g) x 100% = 75%.
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