Acompound 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.

Yes it would be a physical change.