Problem: Consider the following equilibrium:A(g) + B2(g) ⇌ AB2(g);            ∆H = -92 kJThe concentration of A at equilibrium may be increased byA) decreasing the temperature.B) adding B2 to the system.C) adding a catalyst.D) increasing the pressure.E) adding AB2 to the system.

FREE Expert Solution

We’re being asked to identify the correct condition that will increase the concentration of A at equilibrium:

A(g) + B2(g) ⇌ AB2(g);            ∆H = -92 kJ


According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.



Since the reaction is exothermic, ΔH = (–), heat is given off as a product:

A(g) + B2(g) ⇌ AB2(g) + heat


Now, let’s look at each given statement.


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Problem Details

Consider the following equilibrium:

A(g) + B2(g) ⇌ AB2(g);            ∆H = -92 kJ

The concentration of A at equilibrium may be increased by

A) decreasing the temperature.

B) adding B2 to the system.

C) adding a catalyst.

D) increasing the pressure.

E) adding AB2 to the system.

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Our tutors have indicated that to solve this problem you will need to apply the Le Chatelier's Principle concept. You can view video lessons to learn Le Chatelier's Principle . Or if you need more Le Chatelier's Principle practice, you can also practice Le Chatelier's Principle practice problems.