Question

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? (a) exothermic and increasing disorder (b) exothermic and decreasing disorder (c) endothermic and increasing disorder (d) endothermic and decreasing disorder

Name: Problem 18, Chapter 6: A Complete Resource Book in Chemistry for JEE Main 2017
Uploaded: 2020-07-09T15:36:49-08:00
Duration: 56 s
Channel: David Collins
Description: Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? (a) exothermic and increasing disorder (b) exothermic and decreasing disorder (c) endothermic and increasing disorder (d) endothermic and decreasing disorder

   Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?
(a) exothermic and increasing disorder
(b) exothermic and decreasing disorder
(c) endothermic and increasing disorder
(d) endothermic and decreasing disorder

A Complete Resource Book in Chemistry for JEE Main 2017

Atul Singhal 1st Edition

Chapter 6, Problem 18

Instant Answer

Solved by Expert David Collins

07/09/2020

Step 1

A reaction is spontaneous if it leads to a decrease in free energy (ΔG < 0). The Gibbs free energy change can be determined by the equation: ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy Show more…

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Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? (a) exothermic and increasing disorder (b) exothermic and decreasing disorder (c) endothermic and increasing disorder (d) endothermic and decreasing disorder

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Key Concepts

Exothermic Reaction

An exothermic reaction is one in which heat is released into the surroundings, resulting in a negative change in enthalpy (?H). This release of energy can help drive a reaction forward, contributing positively to the overall spontaneity of the process.

Entropy

Entropy is a measure of disorder or randomness within a system. When a reaction results in increased disorder (a higher entropy state), it contributes positively toward the spontaneity of the reaction by increasing the overall energy dispersal in the universe.

Gibbs Free Energy

Gibbs free energy (?G) is the thermodynamic potential that determines whether a reaction can occur spontaneously. It is defined by the equation ?G = ?H - T?S, where a negative ?G indicates that the reaction is spontaneous. Both a negative enthalpy change (exothermic process) and a positive entropy change (increasing disorder) make ?G more negative, favoring spontaneity.

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