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How is enthalpy related to the spontaneity of a reaction?
A. AH=0 contributes to spontaneity.
B. AH<0 contributes to spontaneity.
C. AH> 0 contributes to spontaneity.
D. AH does not affect spontaneity.

Sagot :

Bovageidn

Answer:

D

Explanation:

Gibb's free energy change(∆G) and Standard electrode potential of electrochemical (Ecell) determine the spontaneity of a reaction.

when ∆G > 0, the reaction is not spontaneous

∆G < 0, the reaction is spontaneous

∆G = 0, the reaction is in equilibrium

when Ecell > 0, the redox reaction is spontaneous

Ecell < 0, the redox reaction is not spontaneous

Ecell = 0, the redox reaction is in equilibrium.

ΔH < 0 contributes to spontaneity.

What is a spontaneous reaction?

  • A spontaneous reaction is one that takes place naturally under a certain set of circumstances.
  • The general entropy, or chaos, of the system increases in the presence of spontaneous reactions.

How can we determine if a reaction is spontaneous or not?

We can determine it by calculating Gibb's free energy.

How do we calculate Gibb's free energy?

It is calculated by the formula:

ΔG = ΔH - TΔS

  • ΔG is the change in Gibb's free energy,
  • ΔH is the change in the enthalpy
  • ΔS is the change in entropy.

How does ΔG tells if a reaction is spontaneous or not?

  • If ∆G > 0, the reaction is not a spontaneous reaction
  • ∆G < 0, the reaction is a spontaneous reaction
  • ∆G = 0, the reaction is in equilibrium

How does ΔH contribute to the spontaneity of the reaction?

  • For a reaction to be a spontaneous reaction, ∆G < 0.
  • Consider a reaction, ΔG will be calculated as ΔH - TΔS
  • If ∆H < 0 then the ΔH - TΔS will be a lesser value ( more negative) than it would have been when ∆H = 0 or ∆H > 0.
  • Therefore  ∆H < 0 contributes to spontaneity.

To learn more about ΔH, spontaneous reaction, enthalpy, and entropy here,

https://brainly.com/question/12959763

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