Given below is synthesis of nylon-66. Assume 100 % yield in every step and none of the organic compounds involved are in excess.

Number of moles of hexamethylene diamine (e) = $\frac{290}{116}=2.5$
Number of moles of adipic acid (f) required = 2.5
Mass of adipic acid = 2.5×146 = 365
Number of moles of acetylene (a) required = 5
Mass of acetylene required = 130 g