A copolymer chain contains acrylonitrile (CH2=CH-CN) and buta-1,3-diene (CH2=CH-CH=CH2) units in the mole ratio 1 : 2 (end groups ignored; C 12, H 1, N 14). The mass percentage of nitrogen in the copolymer is

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A copolymer chain contains acrylonitrile ( $CH X_{2} = CH - CN$ ) and buta-1,3-diene ( $CH X_{2} = CH - CH = CH X_{2}$ ) units in the mole ratio 1 : 2 (end groups ignored; C 12, H 1, N 14). The mass percentage of nitrogen in the copolymer is

A17.5
B26.4
C13.1
D8.7

Answer: D

Acrylonitrile unit

C X_{3} H X_{3} N

= 53; butadiene unit

C X_{4} H X_{6}

= 54. One acrylonitrile plus two butadiene units has mass 161 and contains 14 of nitrogen: 8.7 percent. The other values come from using ratio 1:1, ratio 2:1 or pure acrylonitrile.

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A copolymer chain contains acrylonitrile (CHX2​=CH−CN) and buta-1,3-diene (CHX2​=CH−CH=CHX2​) units in the mole ratio 1 : 2 (end groups ignored; C 12, H 1, N 14). The mass percentage of nitrogen in the copolymer is

Answer: D

More questions on Addition polymerisation and mechanism

A copolymer chain contains acrylonitrile ( $CH X_{2} = CH - CN$ ) and buta-1,3-diene ( $CH X_{2} = CH - CH = CH X_{2}$ ) units in the mole ratio 1 : 2 (end groups ignored; C 12, H 1, N 14). The mass percentage of nitrogen in the copolymer is