The endothermic reaction N O (g) ⇌ 2 NO (g) has at 298 K and at 350 K
CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
The endothermic reaction N2O4(g) ⇌ 2 NO2(g) has Kc=0.212 at 298 K and Kc=1.50 at 350 K. Concentrations were monitored as follows:
Time (s) | Temperature (K) | [N2O4] (M) | [NO2] (M)
0 | 298 | 0.100 | 0.146
100 | 350 | 0.100 | 0.146
600 | 350 | 0.060 | 0.300
List all time(s) at which the system was at equilibrium and justify your choices by referencing the appropriate value of Kc.