The heat of vaporization diminishes … Real Systems. 5. To get the heat of vaporization, you simply divide the molar heat by 18.015 g/mol. … ... Molar Enthalpy of Vaporization Formula . Problem 1. q is the amount of absorbed heat; Example1. H v = q / m. Wherein, Hv = vaporization heat. The quantity DH/n is interpreted as D vap H, the molar enthalpy of vaporization. Uses Antoine's equation, which relates saturation pressure to temperature, to determine the heat of vaporization using the Clausius-Clapeyron equation. Temperature (K) A B C Reference Comment; 314.6 - 370.6: 3.9894: 1150.207-63.904: Nickerson, Kobe, et al., 1961: Coefficents calculated by NIST from author's data. See Example #3 below. The mathematical formula used to calculate molar enthalpy of vaporization is: q = n⋅ΔH vap. The (latent) heat of vaporization (∆H vap) also known as the enthalpy of vaporization or evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance, to transform a given quantity of the substance into a gas.. The enthalpy of vaporization of water is ΔH vap = 44.01 kJ mol –1 at standard temperature. Enthalpy of fusion: Δ fus S: Entropy of fusion: Δ sub H: Enthalpy of sublimation: Δ vap H: Enthalpy of vaporization: Δ vap H° Enthalpy of vaporization at standard conditions: ρ c: Critical density m = mass of the substance. Heat of Vaporization Formula. This is the definition of molar enthalpy of vaporization in chemistry, along with the equation used to find it. Heat of vaporization is the amount of heat energy required to change the state of a substance from a liquid into a vapor or gas. q = heat. It is also known as enthalpy of vaporization, with units typically given in joules (J) or calories (cal). How much heat (in kJ) is required to vaporize exactly two moles of water at that temperature? H v = q / m . The following equation is used to calculate the heat of vaporization. A plot of ln (p/p 0) vs. 1/T is constructed, and the slope is interpreted to be according to the indefinite form of the Clausius-Clapeyron equation. The enthalpy of vaporization is a function of the pressure at which that transformation takes place. Heat of Vaporization Formula Based on entropy and enthalpy of vaporization and relationship among them, the Heat of vaporization formula can be written as. A real Clausius-Clapeyron often shows some slight curvature. The heat of vaporization is the total quantity of heat that will vaporize or absorbed in a particular quantity at a pre-defined temperature. Where H v is the heat of vaporization (J/g); q is the total heat of the liquid at the vaporization point. The molar heat of vaporization for water is 40.7 kJ/mol. 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