Igcse Model Questions Vol1 2017 Chemistry Question 27

Adipic acid (\(\mathrm{C_6H_{10}O_4}\), M = 146.14 g mol\(^{-1}\)) and hexamethylenediamine (\(\mathrm{C_6H_{16}N_2}\), M = 116.21 g mol\(^{-1}\)) are reacted to form nylon‑6,6 according to \(\text{HOOC-(CH}_2)_4\text{-COOH} + \text{H}_2\text{N-(CH}_2)_6\text{-NH}_2 \rightarrow \text{[-CO-(CH}_2)_4\text{-CO-NH-(CH}_2)_6\text{-NH-]}_n + n\text{H}_2\text{O}\). 6.00 g of adipic acid and 4.20 g of hexamethylenediamine are mixed, and after the reaction the dried polymer obtained weighs 7.20 g. (a) Identify the limiting reactant. (b) Calculate the theoretical mass of nylon‑6,6 that could be formed. (c) Determine the percentage yield of the polymer. (d) Calculate the mass of water that must have been produced.