Water phase changes constant Temperature remains __________

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Presentation transcript:

Water phase changes constant Temperature remains __________ during a phase change. constant Water phase changes

Latent Heat of Phase Change Molar Heat of Fusion The energy that must be absorbed in order to convert one mole of solid to liquid at its melting point. Molar Heat of Solidification The energy that must be removed in order to convert one mole of liquid to solid at its freezing point.

Latent Heat of Phase Change #2 Molar Heat of Vaporization The energy that must be absorbed in order to convert one mole of liquid to gas at its boiling point. Molar Heat of Condensation The energy that must be removed in order to convert one mole of gas to liquid at its condensation point.

Latent Heat Fusion kJ/kg Melting Point °C Substance Latent Heat Fusion kJ/kg Melting Point °C Latent Heat Vaporization kJ/kg Boiling Point °C Alcohol, ethyl 108 -114 855 78.3 Ammonia 339 -75 1369 -33.34 Carbon dioxide 184 -78 574 -57 Helium   21 -268.93 Hydrogen(2) 58 -259 455 -253 Lead[3] 24.5 372.3 871 1750 Nitrogen 25.7 -210 200 -196 Oxygen 13.9 -219 213 -183 R134a -101 215.9 -26.6 Toluene -93 351 110.6 Turpentine 293 Water 334 2260 (at 100oC) 100

Latent Heat – Sample Problem Problem: The molar heat of fusion of water is 6.009 kJ/mol. How much energy is needed to convert 60 grams of ice at 0C to liquid water at0C? Mass of ice Molar Mass of water Heat of fusion

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