An endothermic reaction generates 3 moles of gaseous products from 6 moles of ga

Question

An endothermic reaction generates 3 moles of gaseous products from 6 moles of gaseous reactant. What are the best conditions (temperature and pressure) that should be used to maximize the amount of gaseous products? Whereas, an exothermic reaction generates 3 moles of gaseous products from 6 moles of gaseous reactant. What are the best conditions (temperature and pressure) that should be used to maximize the amount of gaseous products? (Comment on the practicality of both these conditions.)

Here is what I do know so whoever answers does not have to answer material I already know. I understand that for exothermic reactions high pressure and low temp goes right towards products whereas low pressure and high temp goes left towards the reactants. Endothermic high pressure and low temp goes left towards reactants, whereas low press and high temp goes right towards products. I guess my main question is does this question (besides from these rules I have just listed only have to do with the mole ratios being used up in this question). I would appreciate why I am asked to focus on the practicality of these conditions at the end of this question.... Thanks.

Explanation / Answer

First of all, since both the reaction proceed as: more moles (6) of reactant give less moles(3) of product, it is to be understood that In both the cases, the pressure needs to be increased so as to favour the formation of products and it is not as mentioned in the 2nd paragraph of the explanation of question. So for endothermic reaction, high temperature and high pressure is required to favor the product formation and for exothermic reaction, lower temperature and higher pressure is required to favor the product formation.

The reason why practicality of the conditions have been asked so as to consider the possibility of varying the temperature and pressure as per the requirements to obtain more of products, which is based on Le Chatelier's principle. For example, in case of exothermic reaction, the practicality or possibility of lowering the temperature with increasing the pressure simultaneously needs to be looked on. Similarly in case of endothermic reaction, the possibility of increasing the temperature and increasing the pressure needs to be considered. If we see, the conditions which are to be maintained in both the cases are opposite to each other in terms of temperature and pressure relation. So the practical point of view which is needed is how to increase temperature alongwith high pressure condition (which usually can happen in case of fixed volume case) and also about how to decrease the temperature by increasing the pressure which is not the natural way in case of gases. (In an ideal case, it usually happens that as pressure is increased the temperature of gases increases). So the practicality is asked in order to know if these conditions can be met (specially in case of decreasing temperature with increasing pressure) and if they can how can they be met (specially in case of decreasing temperature with increasing pressure).

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