Hexamethylenediamine (C6H16N2, 116) of mass 580 g is polymerised with the stoichiometric amount of adipic acid (C6H10O4, 146) to a long nylon 6,6 chain (end groups ignored; H2O 18). The mass of polymer formed in grams is

JEE Advanced levelSingle correct optionDifficulty 3 of 3pl152

Hexamethylenediamine ( $C X_{6} H X_{16} N X_{2}$ , 116) of mass 580 g is polymerised with the stoichiometric amount of adipic acid ( $C X_{6} H X_{10} O X_{4}$ , 146) to a long nylon 6,6 chain (end groups ignored; H2O 18). The mass of polymer formed in grams is

Moles of diamine

= 580/116 = 5.00

and adipic acid

= 5.00

(

= 730

g). Each repeat unit forms two amide bonds and releases 2

H X_{2} O

, so water lost

= 10.0 mol = 180

g. Polymer mass

= 580 + 730 - 180 = 1130