The Question: Polystyrene can be prepared by heating styrene with tribromobenzoyl peroxide in the absence of air. A sample prepared by this method has the empirical formula Br3C6H3(C8H8)n, where the value of n can vary from sample to sample. If one sample has 10.46% Br, what is the value of n.
I know the answer is 19 but I have no clue how they got that. The "C6H3" part confuses me. I don't know how to find n with something like that.
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I have no teacher right now so I really appreciate your help. Only two more chapters to go.