[kapital]

Calculate the constant for reaction,  between 1 mol ethanol and 1 mol acetic acid, the catalyst h2so4 is present, the reaction yields 2/3 mol ethyl acetate.

My try: Kc=(products)/(reactants)=(0,6666666)/(1*1)=0,666, but it wrong, Why?

[orgoclear]

     ethanol + acetic acid --> ethyl acetate + water
t=0    1               1                  0                   0
t=teq 1/3            1/3                2/3               2/3

Keq = [water][ethyl acetate]/[ethanol][acetic acid]

as all volume terms cancel out concentration can be replaced by no. of moles
so, Keq = 2/3*2/3/(1/3)(1/3) = 4