A) The following table shows initial rates at different reactant concentrations for the reaction 2NO(g) + O2(g) -> 2NO2(g). i) Which method can be used to monitor the rate of the above reaction? ii) Determine the order of reaction with respect to NO and O2. iii) Write the rate equation for the reaction. iv) Calculate the value of the rate constant, K, for the reaction.

a) (i) Which method can be used to monitor the rate of the above reaction?
The reaction $2\text{NO (g)} + \text{O}_2\text{ (g)} \to 2\text{NO}_2\text{ (g)}$ involves a change in the number of moles of gas (3 moles reactants to 2 moles products) and the formation of a colored product ($\text{NO}_2$ is brown).

• Monitoring the change in pressure at constant volume and temperature.
• Monitoring the change in color intensity (spectrophotometry) due to the formation of brown $\text{NO}_2$.

**a) (ii) Determine the order of reaction with respect to NO and O$_