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Exactly 17.550 g of O2 is required to completely burn a 5.000 g mixture of CH4...

Exactly 17.550 g of O2 is required to completely burn a 5.000 g mixture of CH4 and C2H2 yielding only CO2 and H2O. How many grams of C2H2 were in the original mixture? The combustion equations are:

CH4(g) + 2 O2(g) ----> CO2(g) + 2 H2O(g)

C2H2(g) + 5/2 O2(g) ----> 2 CO2(g) + H20(g)

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