Define what is the percent yield of the reaction

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Problem- In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide: C4H12O4(s) rightarrow 2C2H5OH(l) + 2CO2(g) If 8.16g of glucose are reacted and 1.04 L of CO2 gas are collected at 28.1 Celcius and 0.998 atm, what is the percent yield of the reaction?

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