What is the delta G of a chemical reaction at equilibrium? What happens to a cel
ID: 78345 • Letter: W
Question
What is the delta G of a chemical reaction at equilibrium? What happens to a cell when the chemical reactions attain equilibrium? A reaction "A" has a delta G delta of 4 kCal/mole and another reaction B has a delta G degree of-6kCal/mole. All of the following are true, except:- Reaction A will form less product at equilibrium than reaction B Reaction A will not occur spontaneously Reaction A cannot be coupled to reaction B to make it occur spontaneously In Reaction B, reacting molecules will bind more strongly to each other Which reaction is exothermic? Which reaction is an unfavorable one?Explanation / Answer
Answer 1:
G of a chemical reaction at equilibrium is zero. When the chemical reactions related to a cell attain equilibrium, theoretically, it means there is no net energy going in or out of the cell.
Answer 2: D. (As explained below)
A nonspontaneous reaction does not favor the formation of products at the given set of conditions. Reaction A being non-spontaneous will thus tend to produce less product compared to Reaction B, which is spontaneous. So, option A is correct.
Since value of G is positive for Reaction A, it is a non-spontaneous reaction. So, option B is correct.
Option C is also correct because non-spontaneous reaction can be coupled with spontaneous to make it favorable.
Answer 3:
One cannot conclude on whether the reaction is exothermic or endothermic based on G alone. However, G can tell whether the reaction is endergonic or exergonic, meaning favorable or unfavorable.
G is positive for Reaction A and so the Reaction A is endergonic, that means, it is thermodynamically unfavorable.
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