Zinc dust is stirred into a hot solution of sodium hydroxide that holds $18.45\ \text{g}$ of nitrobenzene. The only reduction product is hydrazobenzene. Every two molecules of nitrobenzene take up 10 electrons in all, and each zinc atom gives up 2. Use C = 12, H = 1, N = 14, O = 16 and Zn = 65 in g/mol. How much zinc is used up?