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1. Methylhydrazine is a colorless liquid that can be used as a solvent, a missile propellant, and in various high-energy fuel applications. Combustion of this compound produces Nz, COe) and H;Ou). Use the tabulated data below to answer the following questions. Methylhydrazine Chemical Formula CH&N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) AH°vap at Tºb AH°fliquid at 298.15 K fgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K 364 K 40.37 kJ/mol 54.14 kJ/mol AH°i 94.50 kJ/mol 134.93 J/mol-K 0.878 g/cm 165.94 J/mol K Other thermochemical data at 298.15 K, 1 atm |AH°rof CO2«g) AH°rof H2Ou) -393.51 kJ/mol -285.83 kJ/mol A. Estimate the standard enthalpy of combustion of methylhydrazine based on the given standard enthalpy of formation values of reactants and products. . B. Write the balanced thermochemical equation for the combustion of methylhydrazine C. Calculate the heat evolved in the combustion of 25.00 liters of methylhydrazine at 298.15 K in air (external pressure of 760 mmHg).

1. Methylhydrazine is a colorless liquid that can be used as a solvent, a missile propellant, and in various high-energy fuel applications. Combustion of this compound produces Nz, COe) and H;Ou). Use the tabulated data below to answer the following questions. Methylhydrazine Chemical Formula CH&N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) AH°vap at Tºb AH°fliquid at 298.15 K fgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K 364 K 40.37 kJ/mol 54.14 kJ/mol AH°i 94.50 kJ/mol 134.93 J/mol-K 0.878 g/cm 165.94 J/mol K Other thermochemical data at 298.15 K, 1 atm |AH°rof CO2«g) AH°rof H2Ou) -393.51 kJ/mol -285.83 kJ/mol A. Estimate the standard enthalpy of combustion of methylhydrazine based on the given standard enthalpy of formation values of reactants and products. . B. Write the balanced thermochemical equation for the combustion of methylhydrazine C. Calculate the heat evolved in the combustion of 25.00 liters of methylhydrazine at 298.15 K in air (external pressure of 760 mmHg).

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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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1. Methylhydrazine is a colorless liquid that can be used as a solvent, a missile propellant, and in various high-energy fuel applications. Combustion of this compound produces Nzg), CO2e) and H2Ou). Use the tabulated data below to answer the following questions. Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) 364 K AH°vap at T° 40.37 kJ/mol AH°fliquid at 298.15 K AH°fgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K 54.14 kJ/mol 94.50 kJ/mol 134.93 J/mol-K 0.878 g/cm³ 165.94 J/mol K Other thermochemical data at 298.15 K, 1 atm AH°rof CO2(g) AH°rof H2O1) -393.51 kJ/mol -285.83 kJ/mol A. Estimate the standard enthalpy of combustion of methylhydrazine based on the given standard enthalpy of formation values of reactants and products. B. Write the balanced thermochemical equation for the combustion of methylhydrazine C. Calculate the heat evolved in the combustion of 25.00 liters of methylhydrazine at 298.15 K in air (external pressure of 760 mmHg). D. Calculate the approximate work involved in the combustion in air (external pressure of 1.00 atm) of 25.00 liters of methylhydrazine at 298.15 K. What assumption did you make for this calculation? E. Calculate the total energy (AU in kJ) involved when 15.0 moles of methylhydrazine are heated from 325 K to its boiling point (T°b) at 1.00 atm. Assume that the volume of methylhydrazine does not change significantly from 325 K to its T°p.
Transcribed Image Text:1. Methylhydrazine is a colorless liquid that can be used as a solvent, a missile propellant, and in various high-energy fuel applications. Combustion of this compound produces Nzg), CO2e) and H2Ou). Use the tabulated data below to answer the following questions. Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) 364 K AH°vap at T° 40.37 kJ/mol AH°fliquid at 298.15 K AH°fgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K 54.14 kJ/mol 94.50 kJ/mol 134.93 J/mol-K 0.878 g/cm³ 165.94 J/mol K Other thermochemical data at 298.15 K, 1 atm AH°rof CO2(g) AH°rof H2O1) -393.51 kJ/mol -285.83 kJ/mol A. Estimate the standard enthalpy of combustion of methylhydrazine based on the given standard enthalpy of formation values of reactants and products. B. Write the balanced thermochemical equation for the combustion of methylhydrazine C. Calculate the heat evolved in the combustion of 25.00 liters of methylhydrazine at 298.15 K in air (external pressure of 760 mmHg). D. Calculate the approximate work involved in the combustion in air (external pressure of 1.00 atm) of 25.00 liters of methylhydrazine at 298.15 K. What assumption did you make for this calculation? E. Calculate the total energy (AU in kJ) involved when 15.0 moles of methylhydrazine are heated from 325 K to its boiling point (T°b) at 1.00 atm. Assume that the volume of methylhydrazine does not change significantly from 325 K to its T°p.
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