For the reaction, A + B rightarrow C + D, Delta Gr degree is -1324 kJ mol-1. Whi

Question

For the reaction, A + B rightarrow C + D, Delta Gr degree is -1324 kJ mol-1. Which one of the following statements concerning this reaction is not valid? If all statements are valid, select option (e). The reaction is thermodynamically favourable. The reaction is spontaneous as written. The products are more stable than the reactants. The reaction will proceed rapidly from left to right. All of these statements are valid. According to the diagram below, Delta Gr degree is negative and the equilibrium composition is rich in products. Delta Gr degree is negative and the equilibrium composition in rich in reactants. Delta Gr degree is positive and the equilibrium composition is rich in products. Delta Gr degree is positive and the equilibrium composition is rich in reactants. Delta Gr degree is zero and the equilibrium composition has equal amounts of reactants and products.

Explanation / Answer

3. The answer is D

A negative G value only implies that the reaction is thermodynamically favorable, or that it is spontaneous. Thermodynamics only deals with whether the reaction will occur, not how fast it will occur. Therefore, the reaction may not be kinetically favorable.

4. The answer is C

The point of the lowest G value on the graph is where G approaches zero, or the reaction approaches equilibrium. At that point, the concentration of the products is greater than the reaction, so the equilibrium composition is rich in products. However, while the G value approaches 0, it is still positive.

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