A reaction has
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Chapter 20 Solutions
Physical Chemistry
- For a first order gas phase reaction A products, k = 7.2 104s1 at 660. K and k = 1.7 102s1 at 720. K. If the initial pressure of A is 536 torr at 295C, how long will it take for the pressure of A to decrease to 268 torr?arrow_forwardThe following rate constants were obtained in an experiment in which the decomposition of gaseous N2O; was studied as a function of temperature. The products were NO, and NO,. Temperature (K) 3.5 x 10_i 298 2.2 x 10"4 308 6.8 X IO-4 318 3.1 x 10 1 328 Determine Etfor this reaction in kj/mol.arrow_forward11.44 A possible reaction for the degradation of the pesticide DDT to a less harmful compound was simulated in the laboratory. The reaction was found to be first order, with k = 4.0 X 10_H s"' at 25°C. What is the half-life for the degradation of DDT in this experiment, in years?arrow_forward
- Diethylhydrazine reacts with iodine according to the following equation: Â (C2H5)2(NH)2(l)+I2(aq)(C2H5)2N2+2HI(aq)The rate of the reaction is followed by monitoring the disappearance of the purple color due to iodine. The following data are obtained at a certain temperature. (a) What is the order of the reaction with respect to diethylhydrazine, iodine, and overall? (b) Write the rate expression of the reaction. (c) Calculate k for the reaction. (d) What must [(C2H5)2] be so that the rate of the reaction is 5.00104mol/Lh when [ I2 ]=0.500M?arrow_forward(a) Explain the following terms :(i) Order of a reaction(ii) Molecularity of a reaction(b) The rate of a reaction increases four times when the temperature changes from 300 K to 320 K. Calculate the energy of activation of the reaction, assuming that it does not change with temperature. (R = 8.314 J K-1 mol-1)arrow_forwardWhat is the activation energy for a reaction if k = 1.89 × 10–1 s–1 at 541 Kelvin and k = 7.31 s–1 at 601 Kelvin, in kJ/mol? Report an integer value, without units.arrow_forward
- 2a) explain the difference between the net energy change of a reaction and the activation energy of the same reactionarrow_forwardA certain reaction has an activation energy of 99.0 kJ/mol and a rate constant of 1.8 s-1 at 123. °C. At what temperature must the reaction be run to decrease the rate by a factor of 4.1?arrow_forwardA student constructed in the rainiest place in found a line of best fit of y=-6,627x+1,532. What is the energy of activation (in kJ/mol).arrow_forward
- a) What is the rate constant for this reaction? b) If the volume of the reaction container is decreased by a factor of 2 (the volume is cut in half), will the reaction rate be faster or slower? By what factor will the rate of the reaction change?arrow_forwardIn the following chemical reaction A + B → 2C + 40KJ at a certain temperature, if you know that the potential energy of the reactants is 80 kilojoules, and the potential energy of the activated complex is 160 kilojoules, and when a catalyst is added, the activation energy for the forward reaction becomes 50 kilojoules, a. What is the value of the activation energy for a reverse reaction in kilojoules in the presence of the catalyst? And without the catalyst? b. What is the value of the potential energy (in kilojoules) of the products of a chemical reaction? c. What is the value of the activated Complex potential energy (in kilojoules) in the presence of the catalyst?arrow_forward
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