Consider each of the following systems at equilibrium. The temperature is kept constant, and in each case the reactants are in a cylinder fitted with a movable piston. For which system(s) will a decrease in pressure favor the formation of products? Check all that apply.  (a)   A(s)   ⇌   2B(s)     (b)   2A(l)   ⇌   B(l)     (c)   A(g)   ⇌   B(s)     (d)   2A(g)   ⇌   B(g)     (e)   A(g)   ⇌   2B(g)

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