Q9 of 55 Page 1

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).

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