Does the number of moles of reaction products increase, decrease, or remain same when each of the following equilibrium is subjected to a decrease in pressure by increasing the volume?
a. `PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g)`
b. `CaO(s)+CO_(2)(g) hArr CaCO_(3)(s)`
c. `3Fe(s)+4H_(2)O(g) hArr Fe_(3)O_(4)(s)+4H_(2)(g)`

Explanation

(i) Pressure will increase in the forward reaction and number of moles of products will increase.
(ii) Pressure will increase in backward reaction and number of moles of products will decrease.
(ii) The change in pressure will have no effect on the equilibrium constant and there will be no change in the number of moles.