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```        A polystyrene, having formula Br3C6H3(C8H8)n was prepared by heating styrene with tribromobenzoyl peroxide in the abscense of air. If it was found to contain 10.46% bromine by weight. Find the value of n.
plz give complete solution.....```
6 years ago

Sudheesh Singanamalla
114 Points
```										Let the weight of polystyrene prepared be 100 g
number of moles of Br in 100g of ploystyrene = 10.46 / 79.9 = 0.1309
From the formula of polystyrene , we have ,
number of moles of Br = 3 * number of moles of Br3C6H3(C8H8)n
0.1309 = 3 * Wt / molar weight
0.1309 = 3*100 / (314.7 + 44n)
0.1309 * ( 314.7 + 44n ) = 300
(314.7 + 44n) = 2291.825
44n = 2291.825 - 314.7
n = 1977.125/44
n = 44.93
n = 45 (approx)
Therefore value of n is 45
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```
6 years ago
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