(a) True. Per leChatelier's principle, adding to one side of the equilibrium pushes the equilibrium to the other side. PCl3 is on the right side, so its addition forces the equilibrium towards the left with PCl5.
(b) False. By the same reasoning as above, addition of Cl2 also forces the equilibrium to the left.
(c) True. A catalyst does not affect the equilibrium; rather, it will increase the speed at which equilibrium is reached.
(d) False. The equilibrium expression has the form [PCl3][Cl2]/[PCl5]. Increasing the volume by a factor n decreases the numerator by a factor of n^2, but only decreases the denominator by a factor of n. The net effect on the concentrations is proportional to 1/n, a decrease; hence, the equilibrium shifts to the right to offset.
(e) False. The reaction is endothermic, so we can think of it as PCl5 + heat --> PCl3 + Cl2. Adding heat stresses the left side, forcing the equilibrium to the right.
(a) True. Per leChatelier's principle, adding to one side of the equilibrium pushes the equilibrium to the other side. PCl3 is on the right side, so its addition forces the equilibrium towards the left with PCl5.
(b) False. By the same reasoning as above, addition of Cl2 also forces the equilibrium to the left.
(c) True. A catalyst does not affect the equilibrium; rather, it will increase the speed at which equilibrium is reached.
(d) False. The equilibrium expression has the form [PCl3][Cl2]/[PCl5]. Increasing the volume by a factor n decreases the numerator by a factor of n^2, but only decreases the denominator by a factor of n. The net effect on the concentrations is proportional to 1/n, a decrease; hence, the equilibrium shifts to the right to offset.
(e) False. The reaction is endothermic, so we can think of it as PCl5 + heat --> PCl3 + Cl2. Adding heat stresses the left side, forcing the equilibrium to the right.
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(a) True. Per leChatelier's principle, adding to one side of the equilibrium pushes the equilibrium to the other side. PCl3 is on the right side, so its addition forces the equilibrium towards the left with PCl5.
(b) False. By the same reasoning as above, addition of Cl2 also forces the equilibrium to the left.
(c) True. A catalyst does not affect the equilibrium; rather, it will increase the speed at which equilibrium is reached.
(d) False. The equilibrium expression has the form [PCl3][Cl2]/[PCl5]. Increasing the volume by a factor n decreases the numerator by a factor of n^2, but only decreases the denominator by a factor of n. The net effect on the concentrations is proportional to 1/n, a decrease; hence, the equilibrium shifts to the right to offset.
(e) False. The reaction is endothermic, so we can think of it as PCl5 + heat --> PCl3 + Cl2. Adding heat stresses the left side, forcing the equilibrium to the right.
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