What is enthalpy of vaporization of water?
What is enthalpy of vaporization of water?
40.65 kJ/mol.
Water has a heat of vaporization value of 40.65 kJ/mol.
What is the enthalpy of vaporization of a compound?
The enthalpy of vaporization (ΔHV, given in units of kJ/mol) is the energy that must be supplied to a unit molar amount of a pure compound to transfer it from the liquid state to the gaseous state at a constant temperature and at the corresponding vapor pressure.
How do you calculate enthalpy of vaporization from boiling point?
Tc = 647.3 K and Pc = 221.2 bar (218.3 atm), the heat of vaporization is obtained as 42,060 J/mol….[edit] Using Riedel’s equation.
| where: | |
|---|---|
| Hv | = Heat of vaporization, in J/mol |
| R | = 8.3144 = Universal gas constant, in J/(K mol) |
| Tn | = The liquid’s normal boiling point, in K |
| Tc | = The liquid’s critical temperature, in K |
What is the enthalpy of vaporization in kJ mol?
The units for the molar heat of vaporization are kilojoules per mole (kJ/mol). Sometimes the unit J/g is used. In that case, it is referred to as the heat of vaporization, the term ‘molar’ being eliminated. The molar heat of vaporization for water is 40.7 kJ/mol.
What is the enthalpy of vaporization and how does it work?
Enthalpy of vaporization is an important property of any liquid, which states that when heat or enthalpy is given to any liquid substance at a certain pressure and temperature, the liquid changes into a gaseous form. Thus, a transformation from one state to other state occurs.
What is C in Clausius Clapeyron equation?
Representation of the Clausius–Clapeyron equation (p = pressure of the phase; T = absolute temperature; ΔH = molar enthalpy of the phase transition; ΔV = difference in the molar volumes of the two phases 1 and 2; c = integration constant; R = gas constant).
How do you calculate the enthalpy of vaporization from temperature and vapor pressure?
If the problem provides the two pressure and two temperature values, use the equation ln(P1/P2)=(Hvap/R)(T1-T2/T1xT2), where P1 and P2 are the pressure values; Hvap is the molar heat of vaporization; R is the gas constant; and T1 and T2 are the temperature values.
