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Q. Reactions between alcohol and carboxylic acid produce esters. However, these reactions do not go to completion, and instead, reach an equilibrium. The most commonly produced ester is ethyl acetate (CH3COOCH2CH3), which is used as a solvent in the pharmaceutical industry and to decaffeinate coffee and tea. Ethyl acetate is produced by reacting ethanol (the alcohol that gets you drunk) with acetate (the acid in vinegar), show in the reaction below: CH3CH2OH(l) + CH2COOH(l) <-> CH3COOCH2CH3(l) + H2O(l) Kc = 3.96 at 80 degree C At 80 C, 25.0 mL of ethanol (d=0.778 g/mL) are reacted with 35.0 mL of acetic acid (d = 1.01 g/mol). What is the equilibrium concentration of ethyl acetate? Report your answer to three significant figures in decimal form, in molarity (units required). What is the equilibrium concentration of acetic acid? Report your answer to three significant figures in decimal form, in molarity (units required).

Solved • May 2, 2020

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Q. When 0.60 mol NH3 is decomposed in a 1 Liter flask at 850 K, the equilibrium concentration of NH3 is measured as 0.12 M. Given that ammonia decomposes according to the reaction 2 NH3(g) <=> N2 (g) + 3H2 (g), what is Kc for the reaction?

Solved • May 2, 2020

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Q. What is the equilibrium partial pressure of ammonia? What is the equilibrium partial pressure of hydrogen sulfide? What is the equilibrium partial pressure of ammonium hydrogen sulfide?

Solved • May 2, 2020

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Q. For the equilibrium 2 NO2(g) <--> N2O4(g), Kp for this reaction is 1.7. If only NO2(g) is present at an initial partial pressure of 0.40 atm, what will the final equilibrium partial pressure of NO2 be if the equilibrium partial pressure of N2O4 is 0.087 atm?

Solved • Apr 27, 2020

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Q. Bromine monochloride decomposes into the elements: 2BrCl (g) <----> Br2 (g) + Cl2 (g) Kc = 65.8 at 580K Initially, 0.500 moles of BrCl are placed into a 2.00 L container at 580K. What will be the concentrations of BrCl and Cl2 when equilibrium is reached?

Solved • Apr 9, 2020

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Q. 6.00 x 10 ̶ 2 mols of, a colorless gas N2O4 is taken in a 1L flask and kept at 25 °C-. At equilibrium a brown gas NO2 is produced. Kp for the reaction at 25 °C is 2.37. Calculate the concentration of NO2 at equilibrium.

Solved • Apr 7, 2020