The enthalpy of vaporization is a function of the pressure at which that transformation takes place. Heat of Vaporization Formula. H v = q / m. Wherein, Hv = vaporization heat. The molar heat of vaporization for water is 40.7 kJ/mol. This is the definition of molar enthalpy of vaporization in chemistry, along with the equation used to find it. q = heat. Where H v is the heat of vaporization (J/g); q is the total heat of the liquid at the vaporization point. … How much heat (in kJ) is required to vaporize exactly two moles of water at that temperature? H v = q / m . Example1. The enthalpy of vaporization of water is ΔH vap = 44.01 kJ mol –1 at standard temperature. Heat of Vaporization Formula Based on entropy and enthalpy of vaporization and relationship among them, the Heat of vaporization formula can be written as. q is the amount of absorbed heat; 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. The heat of vaporization is the total quantity of heat that will vaporize or absorbed in a particular quantity at a pre-defined temperature. The mathematical formula used to calculate molar enthalpy of vaporization is: q = n⋅ΔH vap. The heat of vaporization diminishes … 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. Real Systems. Problem 1. m = mass of the substance. To get the heat of vaporization, you simply divide the molar heat by 18.015 g/mol. A real Clausius-Clapeyron often shows some slight curvature. The quantity DH/n is interpreted as D vap H, the molar enthalpy of vaporization. It is also known as enthalpy of vaporization, with units typically given in joules (J) or calories (cal). 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 Uses Antoine's equation, which relates saturation pressure to temperature, to determine the heat of vaporization using the Clausius-Clapeyron equation. 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. See Example #3 below. 5. Molar heat values can be looked up in reference books. When two states of solutions like vapor or liquid are compared, the kinetic energy of the steam is generally taken higher as compared to the kinetic energy of the fluid. ... Molar Enthalpy of Vaporization Formula . 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