What is percent of C in CO2 (C=12.01 amu, O=16.00 amu)

Answer: 33%

Explanation: Because carbon atoms are only 1/3 of the compound since the other 2 atoms are oxygen. Like H20, Oxygen is one out of the three atoms in the compound.

27.29 % of CO2 is carbon.

Explanation:

Not every element has the same molar mass, so they are present in a different %

Step 1: Calculating the molar mass of CO2

⇒CO2 has 1 carbon atom and 2 oxygen atoms

⇒ Molar mass of C = 12.01g/mole

⇒Molar mass of O = 16g/mole

⇒Molar mass of CO2 = 12.01 + 2*16g/mole = 44.01g / mole

Step 2: find the percentage of Carbon

To find the percentage of carbon, we will calculate the ratio Molar mass Carbon / Molar mass CO2

⇒ (12.01 / 44.01) * 100 % = 0.2729 * 100 % = 27.29 %

27.29 % of CO2 is carbon. This means that 72.71 % of CO2 is oxygen (100 - 27.29 = 72.71)