Consider the following equilibrium: N204(9)
2NO2(9)
Ket
= 5.85 x 10-3

Which statement about this system is true?
Options:
The equilibrium lies to the left.
The equilibrium lies to the right.

If the equilibrium concentration of No, is 1.78 x 10-2 m, the equilibrium concentration of
N204 is
Options:
3.04 M.
1.85 × 10^-6 M.
5.42 × 10^-2 M.

1. The equilibrium lies to the left.  

Explanation:

N₂O₄ ⇌2NO₂; Keq = 5.85 × 10⁻³  

1. Position of equilibrium

Keq < 1, so the position of equilibrium lies to the left.

2. Equilibrium concentration

(a) Set up an ICE table.

(b) Calculate the equilibrium concentration

Check:

It checks.

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"