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An unknown gas, D, reacts with fluorine gas to form the compound DF4(g), as represented by the following equation: D(g)+2 F2(g)→DF4(g). A series of experimental trials were performed at 600° to determine the rate law expression for the reaction. Data from the trials are shown below. Initial PD (torr) Initial PF2 (torr) Initial Rate of Appearance of DF4(g) (torr/min) Trial 1 3000 3000 2.50x10-2 Trial 2 6000 3000 5.0x10-2 Trial 3 3000 6000 10.0x10-2 a) A student claims that the reaction is second order with respect to F2(g). Do you agree or disagree? Justify your answer using the data above. b) What is the initial rate of disappearance of D(g) in trial 3? Justify your answer. c) A student claims that if element D is in group 16, then the molecular geometry of DF4(g) is see- saw. Do you agree or disagree with the student? Justify your answer in terms of VSEPR theory.

An unknown gas, D, reacts with fluorine gas to form the compound DF4(g), as represented by the following equation: D(g)+2 F2(g)→DF4(g). A series of experimental trials were performed at 600° to determine the rate law expression for the reaction. Data from the trials are shown below. Initial PD (torr) Initial PF2 (torr) Initial Rate of Appearance of DF4(g) (torr/min) Trial 1 3000 3000 2.50x10-2 Trial 2 6000 3000 5.0x10-2 Trial 3 3000 6000 10.0x10-2 a) A student claims that the reaction is second order with respect to F2(g). Do you agree or disagree? Justify your answer using the data above. b) What is the initial rate of disappearance of D(g) in trial 3? Justify your answer. c) A student claims that if element D is in group 16, then the molecular geometry of DF4(g) is see- saw. Do you agree or disagree with the student? Justify your answer in terms of VSEPR theory.

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Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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An unknown gas, D, reacts with fluorine gas to form the compound DF4(g), as represented by the following equation: D(g)+2 F2(g)→DF4(g). A series of experimental trials were performed at 600° to determine the rate law expression for the reaction. Data from the trials are shown below. Initial PD (torr) Initial PF2 (torr) Initial Rate of Appearance of DF4(g) (torr/min) Trial 1 3000 3000 2.50x10-2 Trial 2 6000 3000 5.0x10-2 Trial 3 3000 6000 10.0x10-2 a) A student claims that the reaction is second order with respect to F2(g). Do you agree or disagree? Justify your answer using the data above. b) What is the initial rate of disappearance of D(g) in trial 3? Justify your answer. c) A student claims that if element D is in group 16, then the molecular geometry of DF4(g) is see- saw. Do you agree or disagree with the student? Justify your answer in terms of VSEPR theory. The particulate model shown below represents the moles of particles present in the container after D(g) and F2(g) have reacted in a different experiment. Assume that each particle in the diagram represents one mole of the respective substance. (Note: The box corresponding to "Before Reaction" is intentionally left blank.) = D 00 = F2 = DF. Before Reaction After Reaction d) If the total pressure at the end of the reaction is 12 atm, what is the partial pressure of D(g)?
Transcribed Image Text:An unknown gas, D, reacts with fluorine gas to form the compound DF4(g), as represented by the following equation: D(g)+2 F2(g)→DF4(g). A series of experimental trials were performed at 600° to determine the rate law expression for the reaction. Data from the trials are shown below. Initial PD (torr) Initial PF2 (torr) Initial Rate of Appearance of DF4(g) (torr/min) Trial 1 3000 3000 2.50x10-2 Trial 2 6000 3000 5.0x10-2 Trial 3 3000 6000 10.0x10-2 a) A student claims that the reaction is second order with respect to F2(g). Do you agree or disagree? Justify your answer using the data above. b) What is the initial rate of disappearance of D(g) in trial 3? Justify your answer. c) A student claims that if element D is in group 16, then the molecular geometry of DF4(g) is see- saw. Do you agree or disagree with the student? Justify your answer in terms of VSEPR theory. The particulate model shown below represents the moles of particles present in the container after D(g) and F2(g) have reacted in a different experiment. Assume that each particle in the diagram represents one mole of the respective substance. (Note: The box corresponding to "Before Reaction" is intentionally left blank.) = D 00 = F2 = DF. Before Reaction After Reaction d) If the total pressure at the end of the reaction is 12 atm, what is the partial pressure of D(g)?
e) Assuming that only D and F2 are present in the container before the reaction, determine the number of moles of D and F2 that were present in the initial reaction mixture. The equation and enthalpy change for the reaction between D(g) and F2(g) are given: D(g)+2 F2(g)→DF4(g)_ AHo=-250 kJ/malxn f) How much heat is released when 0.75 mol of D(g) reacts with excess F2(g)? Fluorine can also react with another gas, E(g), according to the following equation: E(g)+2 F2(g)>EF4(g)_ AHo=-150 kJ/malxn g) The student claims that the D-F bond energy is less than the E-F bond energy. Do you agree or disagree? Justify your answer. While investigating the properties of other diatomic molecules, the student finds the following diagram, which shows the potential energy of two iodine atoms versus the distance between their nuclei. The student also finds that the l-I bond energy is slightly less than the F-F bond energy. The student incorrectly sketches the potential energy curve for 2| fluorine atoms, shown by the dotted line. 200T 100+ 200 i 600 700 + 100 300i 400 500 800 -100- -200 Internuclear Distance (pm) h) Explain the error with the student's sketch for F2(g). Potential Energy (kJ/mol)
Transcribed Image Text:e) Assuming that only D and F2 are present in the container before the reaction, determine the number of moles of D and F2 that were present in the initial reaction mixture. The equation and enthalpy change for the reaction between D(g) and F2(g) are given: D(g)+2 F2(g)→DF4(g)_ AHo=-250 kJ/malxn f) How much heat is released when 0.75 mol of D(g) reacts with excess F2(g)? Fluorine can also react with another gas, E(g), according to the following equation: E(g)+2 F2(g)>EF4(g)_ AHo=-150 kJ/malxn g) The student claims that the D-F bond energy is less than the E-F bond energy. Do you agree or disagree? Justify your answer. While investigating the properties of other diatomic molecules, the student finds the following diagram, which shows the potential energy of two iodine atoms versus the distance between their nuclei. The student also finds that the l-I bond energy is slightly less than the F-F bond energy. The student incorrectly sketches the potential energy curve for 2| fluorine atoms, shown by the dotted line. 200T 100+ 200 i 600 700 + 100 300i 400 500 800 -100- -200 Internuclear Distance (pm) h) Explain the error with the student's sketch for F2(g). Potential Energy (kJ/mol)
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