Lect 12 States of Matter-2010

# Lect 12 States of Matter-2010 - States of Matter Changes of...

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States of Matter

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Changes of State A change of state or phase transition is a change of a substance from one physical state to another. gas liquid solid sublimation b o i l i n g ( v a p o r i za t i o n ) m elt in g (f u s ion) f r e e z i n g deposition co n d e n s a t i o n
Sublimation/Deposition Diagram

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Sublimation of Iodine
Heat of Phase Change H 2 O(l) H 2 O(g) ∆Η vap = 40.7 kJ/mol H 2 O(l) H 2 O(g) ∆Η vap = 40.7 kJ/mol H 2 O(g) H 2 O(l) ∆Η condens = - 40.7 kJ/mol H 2 O(s) H 2 O(l) ∆Η fusion = 6.01 kJ/mol H 2 O(s) H 2 O(l) ∆Η fusion = 6.01 kJ/mol H 2 O(l) H 2 O(s) ∆Η freezing = - 6.01 kJ/mol

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Problem. The heat of vaporization of ammonia is 23.4 kJ/mol. How much heat is required to vaporize 1.00 kg of ammonia? 23.4 kJ x 1 mol NH x 1.00 x 10 g = 1.38 x
Heating Curve for Water

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Vaporization and Condensation at Equilibrium

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Boiling of a Liquid
Normal Boiling Point of a Liquid The normal boiling point of a liquid is the temperature at which its vapor pressure becomes equal to 1.0 atm (760 mm Hg)

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Vapor pressure of a liquid always increases with temperature.
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