Thermodynamics: chemical equilibrium Flashcards Preview

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Flashcards in Thermodynamics: chemical equilibrium Deck (6)
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1

Give the equation for working out the reaction Gibbs energy, ΔRG in the gas phase and describe how it relates to the reaction

If ΔRG < 0 the forward reaction is spontaneous. 

If ΔRG > 0 the reverse reaction is spontaneous

If ΔRG = 0 the reaction is at equilibrium. 

2

Give the formal definition of the equilibrium constant, K0

Note that for this definition, only gaseous species are involved

3

Extend the formal equation of the equilibrium constant to cater for liquid solutions 

Note that [J] is the equilibrium concentration of species J

c0 is 1moldm-3

4

Give the equation linking K0 and  ΔRG0

5

Define K0

K0 is the equilibrium constant which reflects equilibrium composition 

If K0 is large, products are favoured. 

If K0 is small, reactants are favoured

6

State Le Chatelier's principle

A system at equilibrium, when subjected to a disturbance, responds in a way that tends to minimise the effect of the disturbance