230_Sp10_L17_post - CHEM 230 Sp10 Lecture 17 Chapter 9 K...

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CHEM 230 Sp10 Lecture 17 Chapter 9: K and Thermochemistry 1) Q and K 2) Finding K and putting it on ICE 3) Relationship G and K Session ID 230
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at equilibrium Q = K a A + b B c C + d D Q is the reaction quotient for any given point in the reaction Q = ( a C ) c ( a D ) d ( a A ) a ( a B ) b Freeze the reaction and find Q N 2(g) + 3 H 2(g) 2 NH 3(g) Simplified Q: Q = ( P NH 3 ) 2 ( P N 2 )( P H 2 ) 3
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Concept Question For the following reaction, which is the correct value for Q ? 2 C (s, graphite) + 2 H 2(g) C 2 H 4(g) [C] = 187 mol/L; P H 2 = 2 bar; P C 2 H 4 = 2 bar; K = 1x10 -12 A. 1x10 -12 B. 0.0027 C. 0.5 D. 1 E. 2 F. None of the above
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Concept Question For the following reaction, which is the correct value for Q ? 2 C (s, graphite) + 2 H 2(g) C 2 H 4(g) [C] = 187 mol L -1 ; P H 2 = 2 atm; P C 2 H 4 = 2 atm; K = 10 -12 A. 1x10 -12 B. 0.0027 C. 0.5 D. 1 E. 2 F. None of the above Q = P C 2 H 4 /( P H 2 ) 2 = 2/(2) 2 = 1/2 = 0.5
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Bringing Q to K How would the reaction proceed to result in a increased Q ? What if a decreased Q were desired?
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Concept Question The reaction PCl 5 (g) PCl 3 (g) + Cl 2 (g) has K = 10. With which set of conditions is Cl 2 (g) spontaneously formed? A. P PCl 5 = 1 atm P PCl 3 = 1 atm P Cl 2 = 1 atm B. P PCl 5 = 1 atm P PCl 3 = 5 atm P Cl 2 = 2 atm C. P PCl 5 = 0.1 atm P PCl 3 = 5 atm P Cl 2 = 2 atm D. None of the above
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Concept Question The reaction PCl 5 (g) PCl 3 (g) + Cl 2 (g) has K = 10. With which set of conditions is Cl
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230_Sp10_L17_post - CHEM 230 Sp10 Lecture 17 Chapter 9 K...

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