Solution: Ethyl ethanoate (commonly called ethyl acetate), CH3CO2C2H5, is an important solvent used in nail polish remover, lacquers, adhesives, the manufacture of plastics, and even as a food favoring. It is produced from acetic acid and ethanol by the reaction CH3CO2C2H + C2H5OH ⇌ CH3CO2C2H5 + H2OAt 25°C, Kc = 4.10 for this reaction. In a reaction mixture, the following equilibrium concentrations were observed: [CH3CO2H] = 0.377 M, [H2O] = 0.00818 M, and [CH3CO2C2H5] = 0.924 M What was the concentration of CH3CO2H in the mixture? 

Problem

Ethyl ethanoate (commonly called ethyl acetate), CH3CO2C2H5, is an important solvent used in nail polish remover, lacquers, adhesives, the manufacture of plastics, and even as a food favoring. It is produced from acetic acid and ethanol by the reaction 

CH3CO2C2H + C2H5OH ⇌ CH3CO2C2H5 + H2O

At 25°C, Kc = 4.10 for this reaction. 

In a reaction mixture, the following equilibrium concentrations were observed: 

[CH3CO2H] = 0.377 M, 

[H2O] = 0.00818 M, and 

[CH3CO2C2H5] = 0.924 M 

What was the concentration of CH3CO2H in the mixture? 

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