Răspuns :
acid + alcool <==> ester + H2O
initial 2 moli 5 moli / /
cons./format -x moli -x moli +x +x
echilibru 2-x 5-x x x
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Kc = [H2O][ester]/[acid][alcool] = 4
=> 4 = x²/(2-x)(5-x)
=> 4(10-2x-5x+x²) = x²
=> 3x²-28x+40 = 0
rezolvi ec. de gr. II
=> x = 1,76
=> la final s-a format x moli ester adica x = 1,76 moli ester