Question

Se considera procesul chimic de sinteza a acidului iodhidric, la 628 K :
H₂ (g) + I₂ (g) ⇄ 2 HI (g)
Intr-un vas cu volumul de 2L s-au introdus, 2048 g de amestec echimolecular de hidrogen si iod. Amestecul a fost incalzit la 628K, iar dupa stabilirea echilibrului s-au gasit in amestecul de reactie 384 g de acid iodhidric. Calculati valoarea constantei de echilibru, Kc.

Answer 1

                                H2                     +                     I2            ⇄                2HI
initial :                 8 moli                                     8 moli
au reactionat :     x                                                x
la echilibru :      (8-x)                                         (8-x)                                  2x
" " " " " " ""         6,5 moli                                    6,5 moli                             3
2n + 254n = 2048   8 moli
2x = 3    x = 1,5 moli
la echilibru : [H2} = 6,5/2   [I2] = 6.5/2      [Hi[] = 3/2
Kc = [HI]² / {[H2]·[I2]}  = 9/(6,5)² = 0,2215