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paradox xyz cool Grade: 11
        

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

Answers : (1)

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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Please Approve !


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6 years ago
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