Chapter 7, Problem 49E

Silver is often extracted from ores such as $\text{K}\left[\text{Ag}{\left(\text{CN}\right)}_2\right]$ and then recovered by the reaction

$2\text{K}\left[\text{Ag}{\left(\text{CN}\right)}_2\right]\left(aq\right)+\text{Zn}\left(s\right)\to 2\text{Ag}\left(s\right)+\text{Zn}{\left(\text{CN}\right)}_2\left(aq\right)+2\text{KCN}\left(aq\right)$

(a) How many molecules of $\text{Zn}{\left(\text{CN}\right)}_2$ are produced by the reaction of 35.27 g of $\text{K}\left[\text{Ag}{\left(\text{CN}\right)}_2\right]$?

(b) What mass of $\text{Zn}{\left(\text{CN}\right)}_2$ is produced?