10 Question 17 The recombination of iodine atoms in the gas phase in the presence of argon was investigated and the order of the reaction was determined by the method of initial rates. The initial rates of the reaction 2 1(g) + Ar(g) 12(g) + Arg) were as follows: [1(g)]/(10 mol dm) rateo (mol dm's!) 1.0 8.7 * 10+ 2.0 4.0 6.0 3.48 x 103 1.39 x 102 3.13 x 102 The [Ar] concentration is kept constant at 1.0 mmol dm?. The initial rate law, of the form raten = k.[1]."[Ar]o", needs to have the orders a and b and hence the overall order determined. It has been found that b= 1. By plotting a suitable graph of log(initial rate) vs log(initial concentration), determine the order with respect to iodine I(g), the overall order and hence the rate constant. Use the graph paper supplied and the axis limits to guide you. Use one decimal place for your log values. [10]