ThermodynamicsCh10

ThermodynamicsCh10 - Thermodynamics First Law energy can...

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Thermodynamics First Law – energy can never be created nor destroyed. (from CH 9) We want to be able to predict spontaneity: under given conditions, occurs without outside intervention Different than fast or slow!
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Enthalpy to Predict Spontaneity? C (s) + O2 (g) CO2 (g) ΔHo = -393.5 kJ This process is exothermic and spontaneous . Most exothermic processes are spontaneous . H2O (s) H2O (l) ΔHo = 6.01 kJ This process is endothermic and spontaneous . Dissolving most ionic compounds in water is endothermic and spontaneous . However, many (most?) endothermic processes are not spontaneous .
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Spontaneous Non-spontaneous H = 0
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Entropy Entropy S – How energy is distributed among energy levels of particles in universe disorder of a system Consider placing cards in order If you have 2 cards, there is a 1 in 2 chance they will be in order. (2!) If you have 13 cards (1 suit), there is a 1 in 6 x 109 chance they will be in order. (13!) If you have 52 cards, there is a 1 in 8 x 1067 chance they will be in order. (52!)
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Probability and Microstates More than disorder: Which would require more energy starting with a empty room: to put everything in order or to make it look exactly like this? Room of unnamed S117 student
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Probability and Microstates Positional Probability Gas expansion Phase change solubility
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ΔS = Sf – Si Sgas >> Sliquid > Ssolid S increases when a solute (solid or liquid) is dissolved. S
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This note was uploaded on 01/17/2012 for the course S 117 taught by Professor Stephenjacobson during the Fall '11 term at Indiana.

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ThermodynamicsCh10 - Thermodynamics First Law energy can...

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