The reaction below is exothermic. Which change will increase the number of moles
ID: 103693 • Letter: T
Question
The reaction below is exothermic.
Which change will increase the number of moles of PCl5(g) present?
(A) The volume of the reaction vessel is tripled.
(B) The reaction vessel is cooled.
(C) Some of the Cl2 is removed.
(D) Krypton gas is added to the reaction vessel.
The reaction below is exothermic.
PCl3 (g) + Cl2 (g) PCl5 (g)
Which change will increase the number of moles of PCl5(g) present?
(A) The volume of the reaction vessel is tripled.
(B) The reaction vessel is cooled.
(C) Some of the Cl2 is removed.
(D) Krypton gas is added to the reaction vessel.
Explanation / Answer
when the reaction vessel is cooled, the number of moles of PCl5 will increases. option B is correct
Explanation: For exothermic reactions, decrease in temperature, will move the reaction in forward direction. so when cooling the reaction, the reaction in forward direction and increases the number of moles of PCl5.
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