Nitrogen oxide (NO) has been found to be a key component in many biological processes. I...

Nitrogen oxide (NO) has been found to be a key component in many biological processes. It also can react with oxygen to give the brown gas NO₂. When one mole of NO reacts with oxygen, 57.0 kJ of heat are evolved.

(a) Write the thermochemical equation for the reaction between one mole of nitrogen oxide and oxygen.

(b) Is the reaction exothermic or endothermic?

(c) Draw an energy diagram showing the path of this reaction. (Figure 8.4 is an example of such an energy diagram.)

(d) What is ΔH when 5.00 g of nitrogen oxide react?

(e) How many grams of nitrogen oxide must react with an excess of oxygen to liberate ten kilojoules of heat?

Reference Figure 8.4: