A polystyrene, having the formula Br_(3)C_(6)H_(3)(C_(3)H_(8))_(n),was prepared by heating styrene with tribromobenzoyl peroxide in the absence of air. If it was found to contain 10.46% bromine by weight, find the value of n.

A polystyrene, having the formula Br_(3)C_(6)H_(3)(C_(3)H_(8))_(n),was

1.	A polystyrene, having the formula Br_(3)C_(6)H_(3)(C_(3)H_(8))_(n),was prepared by heating styrene with tribromobenzoyl peroxide in the absence of air. If it was found to contain 10.46% bromine by weight, find the value of n.
Answer» <html><body><p></p>Solution :Let the weight of polystyrene <a href="https://interviewquestions.tuteehub.com/tag/prepared-1163605" style="font-weight:bold;" target="_blank" title="Click to know more about PREPARED">PREPARED</a> be 100 <a href="https://interviewquestions.tuteehub.com/tag/g-1003017" style="font-weight:bold;" target="_blank" title="Click to know more about G">G</a> <br/> `therefore` no. of moels of Br in 100 g of polystyrene `=(10.46)/79.9 = 0.1309` <br/> From the formula of polystyrene, we have <br/> no. of moles of Br = `3 xx` moles of `Br_(2)C_(6)H_(3)(C_(3)H_(8))_(n)` <br/> or `0.1309 = 3 xx (<a href="https://interviewquestions.tuteehub.com/tag/wt-1462289" style="font-weight:bold;" target="_blank" title="Click to know more about WT">WT</a>)/("mol. wt") = (3 xx 100)/(314.7 + 44 n)` <br/> `therefore n = 44.9 = <a href="https://interviewquestions.tuteehub.com/tag/45-316951" style="font-weight:bold;" target="_blank" title="Click to know more about 45">45</a>`</body></html>