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A sample of pure solid naphthalene (C1,Hg) weighing 0.6410 g is burned completely with oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The amount of heat evolved is observed to be 25.79 kJ. (a) Write and balance the chemical equation for the com- bustion reaction. (b) Calculate the standard change in internal energy (AU°) for the combustion of 1.000 mol naphthalene to CO2(g) and H,O(€). (c) Calculate the standard enthalpy change (AH°) for the same reaction as in part (b). (d) Calculate the standard enthalpy of formation per mole of naphthalene, using data for the standard enthalpies of formation of CO2(g) and H,O(€) from Appendix D.

A sample of pure solid naphthalene (C1,Hg) weighing 0.6410 g is burned completely with oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The amount of heat evolved is observed to be 25.79 kJ. (a) Write and balance the chemical equation for the com- bustion reaction. (b) Calculate the standard change in internal energy (AU°) for the combustion of 1.000 mol naphthalene to CO2(g) and H,O(€). (c) Calculate the standard enthalpy change (AH°) for the same reaction as in part (b). (d) Calculate the standard enthalpy of formation per mole of naphthalene, using data for the standard enthalpies of formation of CO2(g) and H,O(€) from Appendix D.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
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A sample of pure solid naphthalene (C1,Hg) weighing 0.6410 g is burned completely with oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The amount of heat evolved is observed to be 25.79 kJ. (a) Write and balance the chemical equation for the com- bustion reaction. (b) Calculate the standard change in internal energy (AU°) for the combustion of 1.000 mol naphthalene to CO2(g) and H,O(€). (c) Calculate the standard enthalpy change (AH°) for the same reaction as in part (b). (d) Calculate the standard enthalpy of formation per mole of naphthalene, using data for the standard enthalpies of formation of CO2(g) and H,O(€) from Appendix D.
Transcribed Image Text:A sample of pure solid naphthalene (C1,Hg) weighing 0.6410 g is burned completely with oxygen to CO2(g) and H,O(€) in a constant-volume calorimeter at 25°C. The amount of heat evolved is observed to be 25.79 kJ. (a) Write and balance the chemical equation for the com- bustion reaction. (b) Calculate the standard change in internal energy (AU°) for the combustion of 1.000 mol naphthalene to CO2(g) and H,O(€). (c) Calculate the standard enthalpy change (AH°) for the same reaction as in part (b). (d) Calculate the standard enthalpy of formation per mole of naphthalene, using data for the standard enthalpies of formation of CO2(g) and H,O(€) from Appendix D.
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