Hybrid Delta 8 Pen Calculate the enthalpy change for the process CCl4(g) gives C(g) plus 4 Cl(g) and calculate bond enthalpy of C Cl in CCl4(g). 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)`. Enthalpy of vaporization Wikipedia when do we use this two equation? is there a specific condition on when to use them ? : r ChemicalEngineering