Solved Hvap = heat of vaporization = constant R= gas Chegg.com a) Show that the value of \Delta H for the adiabatic expansion of a perf.. Chapter 10: Energy Problems (ME fusion vaporization) and Q=mc delta t Science, Chemistry ShowMe If Delta H_(vaporisation) of substance X (l) (molar mass : 30 g mol) is 300 J g at it\'s boling What is `Delta U` when `2.0` mole of liquid water vaporises at `100^(@)C`? The heat of vaporisation `(Delta H_("vap".))` of water at `100^(@)C` is `40.66 KJmol^( 1)`.
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