3. Consider the following gas phase reaction: 2 so: (2) + O:() 2 sos (B) Predict

Question

3. Consider the following gas phase reaction: 2 so: (2) + O:() 2 sos (B) Predict the direction in which the equilibrium shifts (towards the right or left) for the following changes: a. Addition of O: gas c. Removal of SO d. Decreasing the reaction volume 4. a) This experiment that you are conducting this weck is separated into parts What are the [Fe l and [SCN] before mixing in each part? b) Briefly, explain why the ce ncentrations of the Fe and SCN are different in the two parts of the experiment. M1515-YEAR 2017-2018

Explanation / Answer

3 sol:-

(a) addition of O2 in the reaction mixture shifts the equilibrium reaction in forward direction, because concentration of reactants starts increasing.

(b) increase in temperature shifts the reaction in backward direction beccause the reaction is exothermic i.e deltaH= -ve (given).

(c) removal of SO3 shifts the reaction in forward direction , because concentration of products starts decreasimg with removal of SO3 .

(d) decreasing the reaction volume i.e increasing the pressure shifts the reaction towards forwards direction , because in products there are lesser number of gaseous moles.

This all is acc. with Le-Chatelier principle which states that if any kind of change in pressure , temperature and concentration of the equilibrium reaction , then equilibrium will shifts in a direction that tends to undo the effect of change. i.e (1) increase in conc. of reactants or decreasing the conc. of products , shift the equilibrium in forward direction and vice-versa.

(2) for exothermic reaction , increasse in temperature shifts the equilibrium in backward direction .

(3) increase in pressure or decrease in volume shifts the equilibrium in that direction where the lesser number of gaseous moles.

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