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chap-15-2011W-a

Caco3 s k caos co 2 g pcao p pco2 p

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Unformatted text preview: s) K= CaO(s) + CO 2 (g) ( pCaO / p )( pCO2 / p ) ( pCaCO3 / p ) = ( pCO2 / p ) Heterogeneous Equilibrium CaCO3 (s) CaO(s) + CO 2 (g) K = pCO2 / p The pressure of CO2 depends on T, but is independent of the amounts of condensed phases PCO2 does not depend on the amount of CaCO3 or CaO Heterogeneous Equilibrium Hetero How to express the equilibrium constants for the following reactions based on Law of Mass Action. ( PCO / P ) 2 K= C (graphite) + CO2(g) = 2CO (g) ( PCO 2 / P ) CaCO3 (s) PbCl2 ( s ) CaO(s) + CO 2 (g) Pb 2 + ( aq ) + 2Cl − ( aq ) K = pCO2 p 2+ −2 K = [ Pb ][Cl ] The concentration of pure solids and pure liquids are not included The pure are in the expression for the equilibrium constant. in Heterogeneous Equilibrium Hetero Cr2 O7 2- (aq)+H 2 O(l) 2CrO 4 2- (aq)+2H + (aq) 2− 2 + 2 [CrO 4 ] [H ] { }{ } c c K= [Cr2O7 2− ] { } c C (s) + 2 H 2 ( g ) CH 4 ( g ) [CH 4 ] ( ) c K= [H 2 ] 2 ( ) c Reaction Quotient, Q Reaction Reaction quotient (Q) : calculated by substituting the C or P eaction (Q) calculated or of the reactants and products at any time into the of at into equilibrium constant (K) expression. equilibrium • • Re...
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