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  • Write the expression for the equilibrium constant, K_c for each of the following reactions: (i) 2NOCl (g) 2NO g + Cl_ 2( g)

7.4      Write the expression for the equilibrium constant, Kc for each of the following reactions:

      (i)      2NOCl_{(g)}\rightleftharpoons 2NO_{(g)}+Cl_{2}_{(g)}
       (ii)    2Cu(NO_{3})_{2}_{(s)}\rightleftharpoons 2CuO_{(s)}+4NO_{2}_{(g)}+O_{2}_{(g)} 
      (iii)     CH_{3}COOC_{2}H_{5}_{(aq)}+H_{2}O_{(l)}\rightleftharpoons CH_{3}COOH_{(aq)}+C_{2}H_{5}OH_{(aq)}
       (iv)     Fe^{3+}_{(aq)}+3OH^{-}_{(aq)}\rightleftharpoons Fe(OH)_{3}_{(s)}
       (v)       I_{2}_{(s)}+5F_{2}\rightleftharpoons 2IF_{5}

Answers (1)

best_answer

The equilibrium constant for any reaction can be written as (concentration of products) / (concentration of reactants). And we considered constant values for the solids and liquids because their density per unit volume or mass per unit volume does not change.
Thus,
(i) 
K_c = \frac{[NO]^2[Cl_2]}{[NOCl]^2}
(ii) 
  K_c = \frac{[CuO]^2[NO_2]^4[O_2]}{[Cu(NO_3)_2]^2}
(iii)
                                                                          
 K_c = \frac{[CH_3COOH][C_2H_5OH]}{[CH_3COOC_2H5]}       

(iv)
  K_c = \frac{1}{[Fe^{3+}][OH^-]}

(v)
K_c = \frac{[IF_5]^2}{[F_2]^5}                                                                                 

Posted by

manish

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