# UArizona Calculate the Oxygen Produced by Catalytic Decomposition Questions

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Combustion reactions are a notable source of carbon dioxide in the environment. Using
the following balanced equation, how many grams of carbon dioxide are formed when
100.00 g of propane (C3H8) is burned? Express your answer to the correct number of
significant figures and you must show all work in the form of dimensional analysis.
C3H8 + 5O2 -> 3CO2 + 4H2O
Using the balanced equation from Question #8, how many grams of lead will be
produced if 2.54 grams of PbS is burned with 1.88 g of O2? Express your answer to the
correct number of significant figures and you must show all work in the form of
dimensional analysis. (Hint: be sure to work the problem with both PbS and O2).
PbS + 3O2 -> 2Pb + 2SO3
Using the Ideal Gas Law, PV = nRT, where R = 0.0821 L atm/mol K, calculate the
volume in liters of oxygen produced by the catalytic decomposition of 25.5 g potassium
chlorate according to the following reaction. The oxygen is collected at 2.22 atm and
25.44°C. Express your answer to the correct number of significant figures. Be sure to
show all steps completed to arrive at the answer (including any steps where dimensional
analysis).
2KCIO3(s) -> 2KCI(s) + 3Os(g)

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