Problem: The accompanying diagram shows how the free energy, G, changes during a hypothetical reaction A(g) +B(g) →  C(g). On the left are pure reactants A and B, each at 1 atm, and on the right is the pure product, C, also at 1 atm. Indicate whether each of the following statements is true or false.The minimum of the graph corresponds to the equilibrium mixture of reactants and products for this reaction.

FREE Expert Solution

We’re asked to indicate whether the following statement is true or false from the given plot.  


We're given a the plot of Gibb's Energy, G as the hypothetical reaction A (g) + B (g) → C (g) proceeds.


Recall that the change in Gibbs free energy ΔG, tells us whether a reaction is spontaneous or non spontaneous


G=G°f,products-G°f,reactants

• ΔG < 0 or ΔG = (–); the reaction is spontaneous

• ΔG = 0; the reaction is at equilibrium

• ΔG > 0 or ΔG = (+); the reaction is non-spontaneous


From the plot, we can see that the Gibbs energy, G decreases as the reaction proceeds.


Analyzing the statement:

The minimum of the graph corresponds to the equilibrium mixture of reactants and products for this reaction.

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Problem Details

The accompanying diagram shows how the free energy, G, changes during a hypothetical reaction A(g) +B(g) →  C(g). On the left are pure reactants A and B, each at 1 atm, and on the right is the pure product, C, also at 1 atm. Indicate whether each of the following statements is true or false.
A graph has progress of reaction on the x-axis and G on the y-axis (both unscaled). As the reaction progresses, the line dips from high G to low G then increases somewhat.  The difference between the initial and final G is x.

The minimum of the graph corresponds to the equilibrium mixture of reactants and products for this reaction.

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What scientific concept do you need to know in order to solve this problem?

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