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# Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume? (a) PCl _ 5 (g) PCl_ 3 (g)+ Cl_ 2 (g)

7.25     Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?

(a)        $PCl_{5}_{(g)}\rightleftharpoons PCl_{3}_{(g)}+Cl_{2}_{(g)}$

(b)     $CaO(s)+CO_{2}(s)\rightleftharpoons CaCO_{3}(s)$

(c)     $3Fe(s)+4H_{2}O(g)\rightleftharpoons Fe_{3}O_{4}(s)+H_{2}(g)$

Views

According to Le Chatellier's principle, if the pressure is decreased, then the equilibrium will shift in the direction in which more number of moles of gases is present.

So,

• (a)The number of moles of reaction products will increase.
• (b)The number of moles of reaction products will decrease
• (c)The number of moles of reaction products remains the same.

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