In the following reaction sequence, major products \( X \) and \( Y \) are acyclic monomers.
\( 500 \) mol of \( X \) completely reacts with \( 500 \) mol of \( Y \) to give \( 1 \) mol of a single biodegradable acyclic copolymer \( Z \) as the only product. The amount of \( Z \) formed in grams is ________.
Given: Atomic mass (in amu): \( \mathrm{H:1, \; C:12, \; N:14, \; O:16, \; Br:80} \)
