1a) The reaction for the formation of phosgene from carbon monoxide and chlorine
ID: 497658 • Letter: 1
Question
1a) The reaction for the formation of phosgene from carbon monoxide and chlorine CO + Cl2COCl2 is first order in CO and first order in Cl2. Complete the rate law for this reaction in the box below. Use the form k[A]m[B]n... , where '1' is understood for m, n ... (don't enter 1) and concentrations taken to the zero power do not appear. Rate = In an experiment to determine the rate law, the rate constant was determined to be 1.64×10-28 M-1s-1. Using this value for the rate constant, the rate of the reaction when [CO] = 0.673 M and [Cl2] = 0.354 M would be
1b) The gas phase reaction of hydrogen with iodine H2 + I22 HI is first order in H2 and first order in I2. Complete the rate law for this reaction in the box below. Use the form k[A]m[B]n... , where '1' is understood for m, n ... (don't enter 1) and concentrations taken to the zero power do not appear. Rate = In an experiment to determine the rate law, the rate of the reaction was determined to be 1.11×10-21 Ms-1 when [H2] = 2.88×10-2 M and [I2] = 1.67×10-2 M. From this experiment, the rate constant is
1c) In a study of the gas phase decomposition of dinitrogen pentoxide at 335 K N2O5(g)2 NO2(g) + ½ O2(g) the concentration of N2O5 was followed as a function of time. It was found that a graph of ln[N2O5] versus time in seconds gave a straight line with a slope of -6.72×10-3 s-1 and a y-intercept of -1.67 . Based on this plot, the reaction is order in N2O5 and the rate constant for the reaction is
Explanation / Answer
1 a)
rate = k [CO][Cl2]
rate = 1.64×10-28 x 0.673 x 0.354
rate = 3.91 x 10^-29 M /s
1b )
rate = k [H2] [I2]
rate = 1.11×10-21 x 2.88×10-2 x 1.67×10-2
rate = 5.34 x 10^-25 M /s
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