What is the percentage of carbon in CCl4?

In carbon tetrachloride (CCl4), there is one carbon atom and four chlorine atoms. The molecular weight of carbon is approximately 12.01 g/mol, and the molecular weight of chlorine is about 35.45 g/mol. The total molecular weight of CCl4 is 12.01 + (4 × 35.45) = 153.81 g/mol. Therefore, the percentage of carbon in CCl4 is (12.01 / 153.81) × 100 ≈ 7.8%.