What is the mass percent of carbon in carbon dioxide?
The molar mass of carbon dioxide CO2 is 12x1 + 16x2 = 44. 1 g molecule of CO2 contains 1 g atom of carbon. 44g of CO2 will contain 12g of C. The mass percentage of carbon in CO2 is given by the formula
= 12/44 x 100 = 27.27%
The correct answer is (ii).
1