Question

If 6.57 g of iron are reacted with an excess of hydrochloric acid, HCI, then hydrogen gas and14.63 g of iron (III) chloride are obtained. calculate the theoretical yeild and percent of yeild of FeCl3.

Answer 1

Here is a worked example showing how to determine theoretical yield and calculate percent yield.
http://www.jiskha.com/science/chemistry/stoichiometry.html