KINETICS AND EQUILIBRIUM Predicting relative forward and reverse rates of reacti
ID: 553063 • Letter: K
Question
KINETICS AND EQUILIBRIUM Predicting relative forward and reverse rates of reacti Acetic acid and ethanol react to form ethyl acetate and water, like this: HCH,CO2(a)+C2H,OH(a) C2HCO2CH3(a)+H200) Imagine 171. mmol of HCH,CO2 are removed from a flask containing a mixture of HCH,CO2, C2H,OH, C2H,CO,CH and H20 at equilibrium, and then answer the following questions. Zero. Greater than zero, but less than the rate of the reverse reaction Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction Greater than zero, and greater than the rate of the reverse reaction Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction None. What is the rate of the forward reaction before any HCH3CO2 has been removed from the flask? What is the rate of the forward reaction just after the HCH3C02 has been removed from the flask? What is the rate of the forward reaction when the system has again reached equilibrium? How much less HCH C02 is in the Some, but less than 171. mmol flask when the system has again reached equilibrium? 171. mmol More than 171, mmol.Explanation / Answer
Correct option for 1)greater than zero, and equal to the rate of the reverse reaction
reason: As the reaction continues to be at equilibrium, so forward rate=reverse rate, thus concentration of reactants as well as product are visibly constant.
correct option for 2) greater than zero, and less than the rate of the reverse reaction
reason: As the reaction was at equilibrium,so on removal of some amount of reactant ,the rate of forward reaction increases to compensate for the change by producing the reactant at a faster rate.
According to Le Chatlier's principle , in an equilibrium state , a reaction is driven in the direction to curb any change in concentration,temperature,pressure or volume and restore a new equilibrium.
correct option for 3) greater than zero ,and equal to the rate of the reverse reacton
reason:At equilibrium,forward rate=reverse rate, thus concentration of reactants as well as product are visibly constant.
correct option for 4) 171 mmol
reason: 171 mmol of acetic acid is removed under equilibrium conditions ,so again when an equilibrium is reestablished, reverse reaction compensates for the loss of the amount of reactant. Some amount of product reacts to give back the reactants.
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