Experiment 9 Background.docx - Experiment 9 Background...

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Experiment 9 Background Enthalpy of Vaporization of Ethanol by Julia Mitchell Chem 112L-S19 Amos Dwamena October 21 st , 2016 The enthalpy of vaporization, (symbol Δ H vap ), also known as the heat of vaporization or heat of evaporation, is the energy required to transform a given quantity of a substance into a gas at a given pressure (often atmospheric pressure). 1 It is often measured at the normal boiling point of a substance; although tabulated values are usually corrected to 298 K, the correction is often smaller than the uncertainty in the measured value. 2 The heat of vaporization is temperature- dependent, though a constant heat of vaporization can be assumed for small temperature ranges and below T r <<1.0. The heat of vaporization diminishes with increasing temperature and it vanishes completely at the critical temperature (T
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