Lect 12 States of Matter-2010

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

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Unformatted text preview: States of Matter 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 z a t i o n ) m e l t i n g ( f u s i o n ) f r e e z i n g deposition c o n d e n s a t i o n Sublimation/Deposition Diagram 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 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 Vaporization and Condensation at Equilibrium 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) Vapor pressure of a liquid always...
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This note was uploaded on 02/03/2011 for the course CHEM 211 taught by Professor Papanastasiou during the Spring '07 term at George Mason.

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

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