What is the enthalpy of ethanol?
Enthalpy of Combustion
| Substance | Combustion Reaction | Enthalpy of Combustion, ΔH∘c(kJmolat 25∘C) |
|---|---|---|
| ethanol | C2H5OH(l)+3O2(g)⟶2CO2(g)+3H2O(l) | −1366.8 |
| methanol | CH3OH(l)+32O2(g)⟶CO2(g)+2H2O(l) | −726.1 |
| isooctane | C8H18(l)+252O2(g)⟶8CO2(g)+9H2O(l) | −5461 |
| Table 2. Standard Molar Enthalpies of Combustion |
What is the enthalpy of fusion of ethanol?
107.0 J/g
Vendors:
| Physical Properties | Metric | Comments |
|---|---|---|
| Heat of Fusion | 107.0 J/g | Enthalpy of fusion at normal melting point |
| Heat of Vaporization | 837 J/g | Enthalpy of vaporization at normal boiling temperature |
| Thermal Conductivity | 0.0144 W/m-K @Temperature 26.9 °C | gas at saturation vapor pressure |
| 0.169 W/m-K @Temperature 25.0 °C |
What is ethanol enthalpy of vaporization?
Enthalpy of vaporization at standard conditions (nominally 298.15 K, 1 atm.) ΔvapH° (kJ/mol) 42.3 ± 0.4.
What is the standard entropy of ethanol?
Data Table
| T [K] | Molar Entropy [J/(mol*K)] | State |
|---|---|---|
| 298.00 | 282.42 | Vapor |
| 298.00 | 282.59 | Vapor |
| 298.00 | 283.88 | Vapor |
| 298.00 | 301.67 | Vapor |
What is the volatility of ethyl alcohol?
Compared to methoxymethane, ethanol is not nearly as volatile. The boiling point of 78.5°C for ethanol is significantly higher compared with -24.8°C for methoxymethane. This example illustrates the significance of bond strength in general and hydrogen bonding specifically as a determinant of volatility of a molecule.
What is the enthalpy of vaporization of water?
40.65 kJ/mol
On the other hand, the molecules in liquid water are held together by relatively strong hydrogen bonds, and its enthalpy of vaporization, 40.65 kJ/mol, is more than five times the energy required to heat the same quantity of water from 0 °C to 100 °C (cp = 75.3 J/K·mol).