15.80%
20.10%
27.30%
32.30%
Answer is Right!
Answer is Wrong!
The correct answer is $\boxed{\text{C}}$.
The mass percentage of carbon in carbon dioxide (CO2) is calculated by dividing the mass of carbon in one mole of CO2 by the molar mass of CO2 and multiplying by 100%. The molar mass of CO2 is 44.01 g/mol, and the mass of carbon in one mole of CO2 is 12.01 g. Therefore, the mass percentage of carbon in CO2 is:
$$\frac{12.01 \text{ g}}{44.01 \text{ g}} \times 100\% = 27.3\%$$
Option A is incorrect because it is the mass percentage of oxygen in CO2. Option B is incorrect because it is the mass percentage of hydrogen in CO2. Option D is incorrect because it is the mass percentage of nitrogen in CO2.