The chemical formula of glucose is C6H12O6. The weight % of carbon in glucose is:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 40.
To calculate the weight percentage of carbon in glucose (C₆H₁₂O₆), we use the formula:
%Carbon = (Mass of carbon in one molecule/Molar mass of glucose) × 100
- Atomic masses: Carbon (C) = 12, Hydrogen (H) = 1, Oxygen (O) = 16
- Molar mass of glucose = (6 × 12) + (12 × 1) + (6 × 16) = 180 g/mol
- Mass of carbon = 6 × 12 = 72 g/mol
%Carbon = (72/180) × 100 = 40%
Thus, the weight percentage of carbon in glucose is 40%.