calorimetric studies show that the reaction is exothermic. 2no2(g) ⇌ n2o4(g) + 14.1 kcal. based on this…

calorimetric studies show that the reaction is exothermic. 2no2(g) ⇌ n2o4(g) + 14.1 kcal. based on this information, which one--if any--of the following additional changes would increase the molar concentration at equilibrium of n2o4(g)? decrease the concentration of no2(g) increase the temperature none of the above decrease the pressure stir the reaction mixture

calorimetric studies show that the reaction is exothermic. 2no2(g) ⇌ n2o4(g) + 14.1 kcal. based on this information, which one--if any--of the following additional changes would increase the molar concentration at equilibrium of n2o4(g)? decrease the concentration of no2(g) increase the temperature none of the above decrease the pressure stir the reaction mixture

Answer

Explanation:

Step1: Recall Le - Chatelier's principle

Le - Chatelier's principle states that a system at equilibrium will respond to a change in conditions to counteract that change. For the exothermic reaction (2NO_2(g)\rightleftharpoons N_2O_4(g)+14.1\ kcal).

Step2: Analyze effect of decreasing (NO_2) concentration

Decreasing the concentration of (NO_2) (a reactant) will shift the equilibrium to the left to produce more (NO_2), thus decreasing the concentration of (N_2O_4).

Step3: Analyze effect of increasing temperature

Since the reaction is exothermic, increasing the temperature will shift the equilibrium to the left (the endothermic direction) to absorb the added heat, decreasing the concentration of (N_2O_4).

Step4: Analyze effect of decreasing pressure

The reaction has a decrease in the number of moles of gas from left to right ((2) moles of (NO_2) to (1) mole of (N_2O_4)). Decreasing the pressure will shift the equilibrium to the side with more moles of gas (left - hand side), decreasing the concentration of (N_2O_4).

Step5: Analyze effect of stirring

Stirring the reaction mixture only affects the rate of reaching equilibrium, not the position of the equilibrium. So it has no effect on the molar concentration of (N_2O_4) at equilibrium.

Answer:

none of the above