3. Consider the following equilibrium system:
NH$_3$(g) + O$_2$(g) \$\rightleftharpoons\$ NO$_2$(g) + H$_2$O(g)
c. At equilibrium, [NH$_3$(g)] = 0.0721mol/L, [O$_2$(g)] = 0.172mol/L, and [H$_2$O(g)] =
0.218mol/L. If the value of K$_c$ at the current temperature is 2.18, determine the
concentration of NO$_2$(g) at equilibrium.
(3 marks)
d. The system is cooled by 20°C and allowed to come to equilibrium. The
concentration of [NH$_3$(g)] at equilibrium at this new temperature is 0.0318mol/L.
Using your rounded answer from part c), determine the concentrations of the
other chemicals at equilibrium under these new conditions.
Draw an equilibrium curve graph to show the change from the original
equilibrium to this new one, using the correct values for concentration. Please use
a ruler as necessary.
(7 marks)
e. Calculate the value of K$_c$ at this new temperature. Would you predict this reaction
to be exothermic or endothermic? Explain in terms of Le Chatelier's principle.
(4 marks)