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Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) AH°vap at Tºb 364 K 40.37 kJ/mol Cliquid at 298.15 K AH°rgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K ΔΗ, 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).

Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°%) AH°vap at Tºb 364 K 40.37 kJ/mol Cliquid at 298.15 K AH°rgas at 298.15 K Molar heat capacity (liquid) Density (liquid) S° (liquid) at 298.15 K ΔΗ, 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).

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
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Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°b) AH°vap at T°b AH°rliquid at 298.15 K AH°rgas 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 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) -393.51 kJ/mol AH°rof H2Ot1) -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). : 2/2 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°%) at 1.00 atm. Assume that the volume of methylhydrazine does not change significantly from 325 K to its T°p.
Transcribed Image Text:Methylhydrazine Chemical Formula CH,N2 Molar Mass 46.07 g/mol Standard boiling point (T°b) AH°vap at T°b AH°rliquid at 298.15 K AH°rgas 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 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) -393.51 kJ/mol AH°rof H2Ot1) -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). : 2/2 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°%) 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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