Question

Write the expressions for the equilibrium constants, Kc for the following reactions: a) C (graphite) (s) + CO2 (g) => 2CO (g) b) H2S (g) + I2 (s) => 2HI ( g) + S (s) C) 4CuO (s) => 2Cu2O (s) + O2 (g

Answer 1

- Kc for the a) reaction:

`Kc=\frac{\lbrack CO\rbrack^2}{\lbrack CO_2\rbrack^{}}`

- Kc for the b) reaction:

`Kc=(\lbrack HI\rbrack^2)/(\lbrack H_2S\rbrack)`

- Kc for the c) reaction:

`Kc=\lbrack O_2\rbrack`

To write the expression for the equilibrium constant (kc), it is important to remember that:

- The concentration of the products is multiplied in the numerator, while the concentration of the reactants is multiplied in the denominator.

- Only the concentrations of the gaseous and/or dissolved species should be included.