A PHBV chain contains 90 mol percent 3-hydroxybutanoate units (C4H6O2) and 10 mol percent 3-hydroxypentanoate units (C5H8O2). Taking C 12, H 1, O 16 and ignoring end groups, how many 3-hydroxypentanoate units does a chain of molar mass 131100 g/mol contain?

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JEE Advanced levelSingle correct optionDifficulty 3 of 3pl180

A PHBV chain contains 90 mol percent 3-hydroxybutanoate units ( $C X_{4} H X_{6} O X_{2}$ ) and 10 mol percent 3-hydroxypentanoate units ( $C X_{5} H X_{8} O X_{2}$ ). Taking C 12, H 1, O 16 and ignoring end groups, how many 3-hydroxypentanoate units does a chain of molar mass 131100 g/mol contain?

A150
B1311
C1524
D1350

Answer: A

Unit masses are 86 and 100, so the average unit mass is 0.90 x 86 + 0.10 x 100 = 87.4. Number of units = 131100/87.4 = 1500. Ten percent of these are 3-hydroxypentanoate: 150.

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A PHBV chain contains 90 mol percent 3-hydroxybutanoate units (CX4​HX6​OX2​) and 10 mol percent 3-hydroxypentanoate units (CX5​HX8​OX2​). Taking C 12, H 1, O 16 and ignoring end groups, how many 3-hydroxypentanoate units does a chain of molar mass 131100 g/mol contain?

Answer: A

More questions on Biodegradable polymers

A PHBV chain contains 90 mol percent 3-hydroxybutanoate units ( $C X_{4} H X_{6} O X_{2}$ ) and 10 mol percent 3-hydroxypentanoate units ( $C X_{5} H X_{8} O X_{2}$ ). Taking C 12, H 1, O 16 and ignoring end groups, how many 3-hydroxypentanoate units does a chain of molar mass 131100 g/mol contain?