Mole ConceptMedium
Question
A polystyrene of formula Br3C6H2(C8H8) n was prepared by heating styrene with tribromobenzyl peroxide in the absence of air. It was found to contain 10.46% bromine by mass. The value of n is (Br = 80)
Options
A.20
B.21
C.19
D.22
Solution
$10.46 = \frac{3 \times 80}{314 + 108n} \times 100 \Rightarrow n \approx 19$
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