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Originally Posted by sanddrag
How do you find Q though? Does it relate to pressure or temperature or anything? Basically, what makes it different from K?
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You can use pressure or concentration. It is different from K because it can be found at any point, given pressure or concentration. The expression for Q is the same, but the pressures or concentrations given do not have to be at equilibrium. Q determines how the system will get to equilibrium.