Consider these reactions: What is the DG° of the last reaction?
A) -44 kJ/mol
B) -18 kJ/mol
C) +18 kJ/mol
D) +44 kJ/mol
E) Cannot be determined from the information provided.

Question

Consider these reactions:  What is the DG° of the last reaction?
A) -44 kJ/mol 
B) -18 kJ/mol 
C) +18 kJ/mol 
D) +44 kJ/mol 
E) Cannot be determined from the information provided.

Quizplus · Accepted Answer

The last reaction is the reverse of the first reaction, so its DG° is equal in magnitude but opposite in sign. The DG° of the first reaction was given as +18 kJ/mol, so the DG° of the last reaction is -18 kJ/mol. Therefore, the correct answer is B.

Consider These Reactions: What Is the DG° of the Last