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Now we will examine a more complex system. Watch the animation portraying the combustion of propane. The unbalanced chemical equation is given below.

__ C3H8(g) + __O2(g) → __CO2(g) + __H2O(ℓ)

Begin by balancing an element that appears in the fewest different formulas. What coefficient must be added to the CO2 to balance the element C?