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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.....```
8 years ago

```							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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```
8 years ago
```							100g polystyrene contains 10.46g Br240g Br(1mole polystyrene ) By unitary method wecan find Molar mass of polystyrene (100*240)/10.46=2294.45MM=2294.45MM-Mass of each component = 02294.45-(240+72+3+104n)=0So n=19.03If you agree with this solution Plz approve
```
one year ago
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