How do you figure out how mch oxygen gas escaped when Potassium Chlorate is decomposed in a reation? Also what mass of Potassium Chlorate was decomposed in the experiment? I conducted the experiement but don't know how to do this.

Answer 1

Here is an example that is worked for you. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html