A mixture of propane and methane occupied 122 mL at 25⁰C and 1.0 atm.  This mixture was totally burned in excess O2 to produce CO2(g) and H2O(g).  The mass of the CO2 produced was 0.506 g.  What is the mass % composition of the original mixture?  Show all work.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".