Answer: The following data were obtained for the gas-phase

Chapter 15, Problem 15.23

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The following data were obtained for the gas-phase decomposition of dinitrogen pentoxide, 2N2O5(g) 88n 4NO2(g) 1 O2(g) [N2O5]0 (mol/L) Initial Rate (mol L21 s21) 0.0750 8.90 3 1024 0.190 2.26 3 1023 0.275 3.26 3 1023 0.410 4.85 3 1023 where Rate 5 2d3N2O5 4 dt Write the rate law and calculate the value of the rate constant. 21. The decomposition of nitrosyl chloride was studied: 2NOCl(g) 34 2NO(g) 1 Cl2(g) The following data were obtained, where Rate 5 2d3NOCl4 dt [NOCl]0 (molecules/cm3) Initial Rate (molecules cm23 s21) 3.0 3 1016 5.98 3 104 2.0 3 1016 2.66 3 104 1.0 3 1016 6.64 3 103 4.0 3 1016 1.06 3 105 a. What is the rate law? b. Calculate the rate constant. c. Calculate the rate constant for the concentrations given in moles per liter.

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