Question

Consider the following endothermic reaction: N_2 O_4 (g)+Heat↔〖2NO〗_2 (s)

a). In what direction would you expect the equilibrium to shift when the reaction mixture is placed in a low temperature bath?

b). If you carried out this experiment in the lab, what change would you look for to confirm this shift?

c). In what direction would you expect the equilibrium to shift when the reaction mixture is placed in a high temperature bath?

d). If you carried out this experiment in the lab, what change would you look for to confirm this shift?

Answer 1

The above reaction is an endothermic reaction because the heat is written on the left side i.e it requires heat.
1. On lowering the temperature, the reaction will move in a direction that counters this change, hence the reaction will go in the backward direction in accordance to the Le chatelier's principle.
2. the backward reaction results in the fornation of the dimer N2O4, the N2O4 will crytallse as a white solid

3. on increasing the temp the reaction will move in the forward direction

4. The forward reaction will form more of NO2 which will result in a brown colouration.