What is the mass percentage of carbon in carbon dioxide? (A) 0.034%(B) 27.27%(C) 3.4%(D) 28.7%

The correct answer is (B) 27.27%.

Carbon dioxide (CO2) consists of one carbon atom bonded to two oxygen atoms. To determine the mass percentage of carbon in carbon dioxide, we need to calculate the molar mass of carbon and the molar mass of carbon dioxide.

The molar mass of carbon (C) is approximately 12.01 g/mol, and the molar mass of carbon dioxide (CO2) is approximately 44.01 g/mol.

To find the mass percentage of carbon in carbon dioxide, we can use the following formula:

Mass percentage of carbon = (Molar mass of carbon / Molar mass of carbon dioxide) x 100%

= (12.01 g/mol / 44.01 g/mol) x 100%

≈ 27.27%

Therefore, the mass percentage of carbon in carbon dioxide is approximately 27.27%, which corresponds to option (B).