Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: From the following data for three prospective fuels, calculate which could provide the most energy per unit volume:Fuel Density at 20oC (g/cm3) Molar Enthalpy of CombustionkJ/mol Nitroethane, C2 H5 NO

Problem

From the following data for three prospective fuels, calculate which could provide the most energy per unit volume:


Fuel Density at 20oC 
(g/cm3)
 Molar Enthalpy
 of Combustion
kJ/mol 
Nitroethane, C2 H5 NO2 (l)1.052- 1368
Ethanol, C2 H5 OH(l)0.789- 1367
Methylhydrazine, CH6 N2 (l)0.874- 1305



Solution

We are being asked to determine which of the following fuel will give the most energy per unit volume


Fuel Density at 20o
(g/cm3)
 Molar Enthalpy
 of Combustion
kJ/mol 
Nitroethane, C2 H5 NO2 (l)1.052- 1368
Ethanol, C2 H5 OH(l)0.789- 1367
Methylhydrazine, CH6 N2 (l)0.874- 1305


The unit for energy is kJ and the unit for volume is cm3. So that, energy per unit volume is kJ/cm3.


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