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CBSE Class 11-science Answered

A sample of polystyrene prepared by heating styrenc with tribromoben- zoyl peroxide in the absence of air has the formula Br 3 C(,H3(CxHx)„. The number // varies with the condition ot" preparation. One sample of polystyrene prepared in this manner was found to contain 10.46% bromine. What is the value of n?
Asked by puneetgarg2555 | 20 May, 2018, 05:22: PM
answered-by-expert Expert Answer
When styrene is heated with tribromo benzoyl peroxide in absence of air gives a polystyrene with the formula  Br3C6H3(C8H8)n 
 
I n space 100 space g space o f space c o m p o u n d comma open parentheses 10.46 space g space B r close parentheses space open parentheses fraction numerator 1 space m o l space B r over denominator 79.90 space g space B r end fraction close parentheses space equals space 0.1309 space m o l space B r S i e n c e space t h e r e space a r e space 3 space m o l space space B r space m o l space o f space c o m p o u n d space t h e space n u m b e r space o f space m o l space o f space c o m p o u n d space i s space fraction numerator 0.1309 over denominator 3 end fraction space equals space 0.04364 space m o l. T h e space m o l e u l a r space w e i g h t space i s space fraction numerator 100 g over denominator 0.04364 m o l end fraction space equals space 2.29 space cross times space 10 cubed g divided by m o l 3 left parenthesis 79.9 right parenthesis space plus space 6 left parenthesis 12 right parenthesis space plus space 3 space left parenthesis 1 right parenthesis space plus space n left parenthesis 104 right parenthesis space equals space 2290 n equals space 19
Answered by Ramandeep | 21 May, 2018, 12:10: PM

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