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The Mond process is used to purify nickel metal. The first step converts Ni(s) into nickel tetracarbonyl, Ni(CO)4, leaving impurities behind. The temperature is then raised to 250°C which redeposits the pure nickel netal. What is the most likely reason for the high temperature in the second step? Ni(CO)4(g) → Ni(s) + 4 СО(g) AHƒ (kJ/mol) exothermic -602.9 -110.52 S° (J/K mol) 410.6 29.87 entapp 197.56 Nickel carbonyl must be kept in the gas phase in order for the enthalpy to be favorable. The high T keeps the Ni(s) "red hot" to keep it from sticking to the sides of the container. The process in entropy driven and only spontaneous at high T. The process is exothermic so the high T prevents the reaction from running out of control. The equilibrium constant changes with T and the high T is needed to get K = Q.

The Mond process is used to purify nickel metal. The first step converts Ni(s) into nickel tetracarbonyl, Ni(CO)4, leaving impurities behind. The temperature is then raised to 250°C which redeposits the pure nickel netal. What is the most likely reason for the high temperature in the second step? Ni(CO)4(g) → Ni(s) + 4 СО(g) AHƒ (kJ/mol) exothermic -602.9 -110.52 S° (J/K mol) 410.6 29.87 entapp 197.56 Nickel carbonyl must be kept in the gas phase in order for the enthalpy to be favorable. The high T keeps the Ni(s) "red hot" to keep it from sticking to the sides of the container. The process in entropy driven and only spontaneous at high T. The process is exothermic so the high T prevents the reaction from running out of control. The equilibrium constant changes with T and the high T is needed to get K = Q.

Chemistry
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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The Mond process is used to purify nickel metal. The first step converts Ni(s) into nickel tetracarbonyl, Ni(CO)4, leaving impurities behind. The temperature is then raised to 250°C which redeposits the pure nickel netal. What is the most likely reason for the high temperature in the second step? Ni(CO)4(g) → Ni(s) + 4 СО(g) AHƒ (kJ/mol) exothermic -602.9 -110.52 S° (J/K mol) 410.6 29.87 entapp 197.56 Nickel carbonyl must be kept in the gas phase in order for the enthalpy to be favorable. The high T keeps the Ni(s) "red hot" to keep it from sticking to the sides of the container. The process in entropy driven and only spontaneous at high T. The process is exothermic so the high T prevents the reaction from running out of control. The equilibrium constant changes with T and the high T is needed to get K = Q.
Transcribed Image Text:The Mond process is used to purify nickel metal. The first step converts Ni(s) into nickel tetracarbonyl, Ni(CO)4, leaving impurities behind. The temperature is then raised to 250°C which redeposits the pure nickel netal. What is the most likely reason for the high temperature in the second step? Ni(CO)4(g) → Ni(s) + 4 СО(g) AHƒ (kJ/mol) exothermic -602.9 -110.52 S° (J/K mol) 410.6 29.87 entapp 197.56 Nickel carbonyl must be kept in the gas phase in order for the enthalpy to be favorable. The high T keeps the Ni(s) "red hot" to keep it from sticking to the sides of the container. The process in entropy driven and only spontaneous at high T. The process is exothermic so the high T prevents the reaction from running out of control. The equilibrium constant changes with T and the high T is needed to get K = Q.
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