18. Nitrogen monoxide is a major cause of acid rain in the atmosphere. One major source of nitrogen monoxide is the direct combination of nitrogen and oxygen gas in automobile engines. The value of KC for this reaction is 1.7103 at 2300K. A mixture of 0.319M nitrogen gas and 0.0859M oxygen gas (which approximates the nitrogen and oxygen concentrations in an automobile cylinder) is heated to 2300K. The enthalpy of the balanced reaction is H= +180.50kJ. a) (2pts.) Write the balanced reaction below. b) Draw a reaction progress (reaction coordinate) diagram that supports your answer in part b on the right. (i) (2 pts.) Label the x-axis, label the reactants and products according to the reaction above. (ii) (2 pts.) Put an arrow with a star () next to it to identify the energy difference that shows that the reaction is endo- or exothermic. to it to identify the energy difference that requires collisions with the right energy and orientation for the reaction to occur. (iv) ( 1pt.) What is the energy gap in part (iii) called? c) (3 pts.) When the system is already at equilibrium, the reaction is cooled at T1. Show how the concentrations of O2,N2 and NO change as a function of time after T1 in the graph on the right