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1) When a mass, m, of cyclohexane is burnt in a constant volume bomb calorimeter with heat capacity Ceal the temperature of the water surrounding the calorimeter is raised by AT- The heat of combustion of the nichrome wire used to ignite the reactive mixture is q. The lengths of the nichrome wire before and after combustion are L, and L, respectively. The combustion reaction is carried out at temerature T and pressure P. The standard molar enthalpy of combustion of cyclohexane is written as AH°. Table 1: Experimental conditions and thermodynamic data for the combustion in the bomb calorimeter A Ho m Ccal q Lo L T P -3951 +/-19 kJ/mol 0.78 +0.002 g 8222.0+/8.0 J/k -9.6 J/cm 9. 39 +0.05 cm 3. 39 +/-0.05 cm 20.65 +/-0.04 C 25.8 +/-1.0 bar

1) When a mass, m, of cyclohexane is burnt in a constant volume bomb calorimeter with heat capacity Ceal the temperature of the water surrounding the calorimeter is raised by AT- The heat of combustion of the nichrome wire used to ignite the reactive mixture is q. The lengths of the nichrome wire before and after combustion are L, and L, respectively. The combustion reaction is carried out at temerature T and pressure P. The standard molar enthalpy of combustion of cyclohexane is written as AH°. Table 1: Experimental conditions and thermodynamic data for the combustion in the bomb calorimeter A Ho m Ccal q Lo L T P -3951 +/-19 kJ/mol 0.78 +0.002 g 8222.0+/8.0 J/k -9.6 J/cm 9. 39 +0.05 cm 3. 39 +/-0.05 cm 20.65 +/-0.04 C 25.8 +/-1.0 bar

Principles of Modern Chemistry
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter12: Thermodynamic Processes And Thermochemistry
Section: Chapter Questions
Problem 75AP
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Given that the magnitudes of the standard molar heat of combustion of graphite and hvdrogen (H2) are -285.83 and -395. 51k]/mol respectively, determine the standard molar head of formation (Deltaa H) of cyclohexane using the appropriate data from Table 1. (Pay attention to the signs!) Need delta H and its standard deviation, unit is kJ/mol 

 

1) When a mass, m, of cyclohexane is burnt in a constant volume bomb calorimeter with heat capacity Ceal the temperature of the water surrounding the calorimeter is raised by AT- The heat of combustion of the nichrome wire used to ignite the reactive mixture is q. The lengths of the nichrome wire before and after combustion are L, and L, respectively. The combustion reaction is carried out at temerature T and pressure P. The standard molar enthalpy of combustion of cyclohexane is written as AH°. Table 1: Experimental conditions and thermodynamic data for the combustion in the bomb calorimeter A Ho m Ccal q Lo L T P -3951 +/-19 kJ/mol 0.78 +0.002 g 8222.0+/8.0 J/k -9.6 J/cm 9. 39 +0.05 cm 3. 39 +/-0.05 cm 20.65 +/-0.04 C 25.8 +/-1.0 bar
Transcribed Image Text:1) When a mass, m, of cyclohexane is burnt in a constant volume bomb calorimeter with heat capacity Ceal the temperature of the water surrounding the calorimeter is raised by AT- The heat of combustion of the nichrome wire used to ignite the reactive mixture is q. The lengths of the nichrome wire before and after combustion are L, and L, respectively. The combustion reaction is carried out at temerature T and pressure P. The standard molar enthalpy of combustion of cyclohexane is written as AH°. Table 1: Experimental conditions and thermodynamic data for the combustion in the bomb calorimeter A Ho m Ccal q Lo L T P -3951 +/-19 kJ/mol 0.78 +0.002 g 8222.0+/8.0 J/k -9.6 J/cm 9. 39 +0.05 cm 3. 39 +/-0.05 cm 20.65 +/-0.04 C 25.8 +/-1.0 bar
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