What is Riedel equation?

[edit] Using Riedel’s equation Riedel proposed an empirical equation for estimating a liquid’s heat of vaporization at its normal boiling point. [9] The equation may be expressed as: (3) where: Hv. = Heat of vaporization, in J/mol.

How do you calculate heat of vaporization?

Heat Of Vaporization Formula

  1. What is Heat of Vaporization?
  2. Heat of Vaporization Formula.
  3. Hv = q / m.
  4. Example1.
  5. If the heat of vaporization for H20 is 2357 J/g, calculate the total amount of heat energy that required to vaporize 145 grams of H20.
  6. Solution:

How do you calculate the enthalpy of vaporization of a liquid?

Use the formula q = m·ΔHv in which q = heat energy, m = mass, and ΔHv = heat of vaporization.

What is Delta HVAP?

The enthalpy of vaporization (symbol ∆Hvap), also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance to transform a quantity of that substance into a gas.

What is latent heat of vaporization of water?

The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol. The vaporization is the opposite process of condensation.

What is enthalpy of vaporization of water?

In the case of water the molar enthalpy of vaporization is 40.67 kJ mol–1. In other words. H2O(l)100oC→H2O(g)

How to improve the performance of the Riedel equation?

Following a previous work of the author, the performances of the Riedel equation are greatly improved by allowing a temperature dependence of the Riedel parameter 0.0838, which is assumed constant in the unmodified Riedel equation.

Why is the Riedel equation better than the Miller Lee-Kesler and Ambrose-Walton equations?

With these modifications, the Riedel equation is significantly better than the Miller, Lee–Kesler and Ambrose–Walton equations. This superiority is particularly evident in the case of strongly associated compounds, like alcohols.

What is the riddle equation in chemistry?

Riddle equation was obtained by the integration of Clapeyron equation, assuming the linearity of the enthalpy changes with temperature. This equation can predict with high accuracy, the vapor pressure of pure compounds using the initial data including Tb, Tc and Pc [8].

What is the Riedel vapor pressure correlation model?

The Riedel vapor pressure correlation is a useful model that has been employed for decades. The shape of the temperature dependent correlation is a strong function of the value of the final coefficient (denoted as E), particularly at the low temperature end.