CHEM 110 Lecture Notes - Lecture 14: Forward Rate, Evaporation, Microsoft Powerpoint
Document Summary
Endothermic: vaporization, sublimation, melting (energy is required to add heat to intermolecular forces) Exothermic: condensation, deposition, freezing (energy is released when intermolecular interactions are formed) Hvap = amount of heat needed to vaporize 1 mole of substance (endothermic is de ned as positive, reverse process is negative. Hfus = amount of heat needed to melt 1 mole of substance. Hsub = amount of heat needed for 1 mole of substance to go from solid to gas. Hvap>>hgas (almost all of imf have to be overcome during vaporization. Heat capacity- the amount of heat required to raise the temperature by 1k of a speci ed amount of a substance. Cs = speci c heat capacity (heat capacity per gram) Cm = molar heat capacity (heat capacity per mole) Heat capacity is different for each substance. The higher the speci c heat capacity, the more heat we have to put in to get it hot.
