Question

What is the mass percent of carbon in carbon dioxide?

• A. 27.27 %
• B. 3.4 %
• C. 0.034 %
• D. 28.7 %

Answer 1

The correct option is A 27.27 %

Determining the mass of carbon in $C{O}_2$

Chemical formula of carbon dioxide = $C{O}_2$

Molar mass of $C{O}_2=44gmo{l}^{-1}$

Molar mass of carbon = $12gmo{l}^{-1}$

Thus, 12 g of carbon atoms are present in 44 g of $C{O}_2$.

Mass percentage of carbon in $C{O}_2$

Mass percentage $=\frac{\text{Mass of carbon}}{\text{Mass of carbon dioxide}}\times 100$

$=\frac{12}{44}\times 100$

= 27.27 %

Thus, mass percentage of carbon in carbon dioxide is 27.27 %.