Question

Which of the following actions will cause the equilibrium to shift such that the concentration of NO gas will increase? 2NO(g) + 2H2(g) ⇌ N2(g)+2H2O+heat View Available Hint(s) Which of the following actions will cause the equilibrium to shift such that the concentration of gas will increase? Lower the reaction temperature Increase the concentration of H2O(g) Decrease the concentration of N2(g) Increase the concentration of H2(g)

Answer 1

Answer:

(b) increase the concentration of H2O

Explanation:

Le Chatelier´s principle will help us to answer this question.

According to this principle if the system is at at equilibrium, any stress or change on it will be responded by the system in such a way as to partilly offset this stress by shifting the equilibrium to attain this equilibria again.

The equilibrium is:

2NO(g) + 2H2(g) ⇌ N2(g)+2H2O+heat

We are interestested in favoring the NO reactant concentration, i.e favor the left side.

(a) Lower the temperature:

the reaction is exothermic, that is liberates heat, so the equilibrium will favor the liberation of heat when the temperature is lowered, so the equilibrium shifts to the right.

(b) Increase the concentration of water gas:

The system will react by consuming partially more water thus shifting the equilibrium towards the left,  increasing the concentration of NO and H2 gas.

(c) Decreasing the concentration of N2 will make the system react towards the producing some N2  to offset the change favoring the right side.

(d) Increasing the concentration of H2 will favor the product side by removing some of the added H2 thus decreasing the concentration of NO.