Chemistry 122:The Equilibrium Constant Kp

Chemistry 122:The Equilibrium Constant Kp - Chemistry 121...

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Chemistry 121 2/24/2014 The Equilibrium Constant K p Since pressure is proportional to concentration for gases in a closed system, the equilibrium expression can also be written K p = (P C ) c (P D ) d / (P A ) a (P B ) b aA+ bB  cC + dD Relationship between K c and K p - From the ideal-gas law we know that PV= nRT - Rearranging it, we get P= (n/V) RT Plugging this into the expression for K p, for each substance, the relationship between K c and K p becomes K p = K c (RT) Δn Where Δn= (moles of gaseous product) - (moles of gaseous reactant) By merely looking at the magnitude of K c , you can tell whether a particular eq. favors products or reactants - If K>> 1, the reaction is product- favored: product predominates at equilibrium. - If K <<1, the reaction is reactant- favored; reactant predominates at equilibrium.
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Manipulating Equilibrium Constants (1): Direction of the chemical eq. and K c The equilibrium constant of a reaction in the reverse reaction is the reciprocal of the equilibrium constant of the forward reaction: N 2 O 4 (g)  2NO 2 (g)
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