Question

What would happen to the following endothermic reaction that is in equilibrium if heat is added? N2O4 (g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. 2 NO2 (g):

1) The reaction would not be affected

2) The equilibrium would shift to the left

3) The equilibrium would shift to the right

4) The product concentration would equal the reactants

Answer 1

The event that will happen to the following endothermic reaction that is in equilibrium if heat is added is that The equilibrium would shift to the right. The correct answer from your choices is number 3.

Answer 2

The reaction N2O4 (g) <--> 2NO2 (g) is endothermic, meaning that it consumes heat to move towards formation of the products.
According to Le Chatelier's Principle, therefore, if heat is added, more product (NO2) will be produced, and equilibrium would shift towards the right side. This is choice 3.