標題:
PHYSICAL CHEM QUESTION
發問:
1.when 1 mole of pure ethyl alcohol is mixed with 1 mole of acetic acid at room temperature, the equilibrium mixture contains 2/3 mole each of ester and water.a)What is the equilibrium const.? (4)b)How many moles of ester are formed at equilibrium when 3 moles of alcohol is mixed with 1mole of acid? All... 顯示更多 1.when 1 mole of pure ethyl alcohol is mixed with 1 mole of acetic acid at room temperature, the equilibrium mixture contains 2/3 mole each of ester and water. a)What is the equilibrium const.? (4) b)How many moles of ester are formed at equilibrium when 3 moles of alcohol is mixed with 1mole of acid? All substances are liquid at the reaction temperature. (0.903 mol) 2.at 27 degree celsius and 1 atmospere,N2O4 is 20% dissociated into NO2.Find a)Kp (0.167 atm) b)the per cent dissociation at 27 degree celsius and a total pressure of0.90 atmospere c)what is the excent of dissociation in a 69 gramme sample of N2O4 confined in a 20 dm^3 vessel at 27 degree celsius?(19.13%) 3.if nitrogen tetroxide is 35% dissociated into nitrogen dioxide under a pressure of 2 atm,calculatethe equilibrium const in terms of partial prossures and the percentage dissociation of the nitrogen totroxide at the same temperature but under 1 atmospheric pressure.(Kp=1.117 atm , 46.7%) 括號內為答案
最佳解答:
1a) Kc = [ester][water]/{[alcohol][acid]} = (2/3 x 2/3)/(1/3 x 1/3) = 4 b) Suppose that x moles of ester and water are formed, then: No. of moles of alcohol = 3 - x, no. of moles of acid = 1 - x Hence: x2/[(3 - x)(1 - x)] = 4 x2 = 4x2 - 16x + 12 3x2 - 16x + 12 = 0 x = 0.903 or 4.43 (rejected since x
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