Question

Calculate the % composition of Carbon in $C{O}_2$. Molar mass is 44.01.

• A. 40%
• B. 67%
• C. 30%
• D. 27%

Answer 1

The correct option is D 27%

Molar mass of compound:
Mass due to carbon: 12.01 g/mol
Total molar mass $=12.01+2\left(16.00\right)=44.01g/mol$ ($C{O}_2$ has two $O_2$ atoms)
Percent composition of carbon: $12.01/44.01\times 100=27.28$%