10 Reaction Rates

# 10 Reaction Rates - Determine the temperature at which the...

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1 1 Determine the temperature at which the equilibrium constant K = 1 for the following reaction. ± H 2 (g) + CO 2 (g) ' H 2 O(g) + CO(g) ± Δ H o = 41.17 kJ, Δ S o = 42.08 J/K ± Δ G T = Δ G o T + RT ln(Q) ± Δ G o T = Δ H o –T Δ S o ± 273 K = 0 o C A) 1 o C B) 705 o C C) 507 o C D) 408 o C E) 804 o C Gives the free energy change for any temperature, T, and any concentrations. Gives the free energy change for any temperature when the concentrations are 1 M and the pressure is 1 atm. 2 Determine the temperature at which the equilibrium constant K = 1 for the following reaction. ± H 2 (g) + CO 2 (g) ' H 2 O(g) + CO(g) ± Δ H o = 41.17 kJ, Δ S o = 42.08 J/K ± Δ G T = Δ G o T + RT ln(Q) ± Δ G o T = Δ H o Δ S o ± At equilibrium Δ G = 0 and Q = K. ± So Δ G T = 0 = Δ G o T + RT ln(K) ± Δ G o T = - RT ln(K) ± K = 1 so Δ G o T = 0 ± Δ G o T = Δ H o Δ S o = 0 ± T = Δ H o / Δ S o = 978 K or 705 o C

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2 3 What do you need for this week’s workshops on Wednesday and Thursday? ± See the course schedule! ± The activity book : Solving Real Problems with Chemistry ± Activity: The Time of Death ± Graph paper or laptop with Excel to make graphs ± Need to determine the slope of a line 4 Chemical Reactions are Dynamic ± Reactants ± Products ± Products ± Reactants ± Reactants ' Products ± Equilibrium is reached when the rate of the forward reaction = rate of the reverse reaction. ± Same equilibrium concentrations result whether one starts with reactants or products. 2 NO 2 ' 2 NO + O 2
3 5 Rates of Chemical Reactions ± Chemical kinetics is the study of the rates of chemical reactions.

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## This note was uploaded on 02/13/2011 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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10 Reaction Rates - Determine the temperature at which the...

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