Question

Under what conditions will the following reaction be the most product-favored?

N2O(g) + NO2(g) <==> 3 NO(g) ; H = + 156 kJ

A. low pressure, low temperature B. high pressure, low temperature C. high pressure, high temperature D. low pressure, high temperature

Answer 1

D.) The above reaction given is an endothermic reaction because here Delta H given is positive . Endothermic reaction are those reactions which absorbs heat.

This reaction will be most product favoured at high temperature and low pressure .

Effect of high temperature: An endothermic reaction absorbs heat from the sorroundings for the formation of products. When temperature is increased ,it increases the amount of product formed ,and decreases the amount of reactants. So high temperature favours the product based endothermic reaction whereas reactant based endothermic is favoured by low temperature.

Effect of pressure: Effect of pressure on a reaction is due to number of moles of gas. Because in case of gases, with decrease in pressure, volume increases . Here number of moles of gas are more on product side than the reactant side. So the product based reaction will be favoured by low pressure . This is explained by le chatelier principal.