In an industrial process, the following reaction is carried out in the presence of a catalyst:

C16H65 + Cl2 �¨ C16H65Cl12

Calculate the percentage yield if 164.57 grams of C16H65 are used in the reaction and 400.24 grams of C16H65Cl12 are produced.

A simple stoichiometry problem with percent yield stuck on at the end.

Here is an example of a simple stoichiometry problem. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html