How many L of O2 are produced when 2.53 g of KClO3 (122.55g/mol) reacts at 0.934 atm and 354 K?

Answer 1

Here is an example problem I posted using stoichiometry. Just follow the steps. Remember when you find moles O2, to use PV = nRT to convert to volume.
http://www.jiskha.com/science/chemistry/stoichiometry.html