The decomposition of KClO3 produces oxygen gas and solid KCl. What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133 Celsius and .88 atm?

Question

I know I need to use PV=nRT but I can't figure out how.

Answer 1

Here is a worked example on the decomposition of KClO3. To convert 126 L O2 to n = mols, use PV = nRT and solve for n, then follow the instructions beginning with step 3.
http://www.jiskha.com/science/chemistry/stoichiometry.html

Answer 2

thank you!