A compound of carbon and bromine contains 6.99% carbon and has a molar mass of 515.4 g/mol. What is the empirical formula of this compound?

CBr2

C2Br

C2Br3

C3Br6

The answer is the last option. A compound of carbon and bromine contains 6.99% carbon and has a molar mass of 515.4 g/mol. The empirical formula is C3Br6.

515.4 g/mol (0.0699) = 36.03 g/mol

The value obtained is the total molar mass of the carbon.

36.03 g/mol (12.01 g/mol) = 3 Carbon atoms

From the choices, only the last option has three atoms.