404SolubilityProduct

404SolubilityProduct - Vant Hoff Equation The vant Hoff...

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Lesson 19 1 Lesson 19 Van’t Hoff Equation The van’t Hoff equation can be used to estimate K c or K p at a given temperature, provided that K c or K p are known at some other temperature: 2 1 1 2 1 1 ln T T R H K K c c T 1 and T 2 have the units of K, and H is the enthalpy of reaction Lesson 19 2 SO 2 ( g ) + O 2 ( g ) = 2 SO 3 ( g ) Lesson 19 1 2 1 2 1 2 2 1 2 1 2 1 1 0 ln 0 1 1 0 1 1 1 1 c c c c c c K K K K K K T T R H T T T T For exothermic reactions ( H < 0 ), if T 2 > T 1 Van’t Hoff equation agrees with Le Chatelier’s principle
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Lesson 19 2 Lesson 19 Example 1 The equilibrium constant K p for the reaction 2 SO 2 ( g ) + O 2 ( g ) = 2 SO 3 ( g ) are tabulated below at several temperatures: T (K) K p (atm –1 ) 800 9.1 × 10 2 850 1.7 × 10 2 900 4.2 × 10 1 950 1.0 × 10 1 a) Estimate H for this reaction b) At what temperature does
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404SolubilityProduct - Vant Hoff Equation The vant Hoff...

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