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BlueWaaaazzzBerry
10.12.2019 •
Chemistry
For a chemical reaction to be spontaneous at all temperatures, which of the following conditions must be met? a. δs° > 0, δh° > 0 b. δs° > 0, δh° < 0 c. δs° < 0, δh° < 0 d. δs° < 0, δh° > 0 e. it is not possible for a reaction to be spontaneous at all temperatures.
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Ответ:
b. ΔS° > 0, ΔH° < 0
Explanation:
According the equation of Gibb's free energy -
∆°G = ∆°H -T∆°S
∆°G = is the change in gibb's free energy
∆°H = is the change in enthalpy
T = temperature
∆°S = is the change in entropy .
And , the sign of the Δ°G , determines whether the reaction is Spontaneous or non - Spontaneous or at equilibrium ,
i.e. ,
if
Δ°G < 0 , the reaction is Spontaneous Δ°G > 0 , the reaction is non - Spontaneous Δ°G = 0 , the reaction is at equilibriumThe reaction has the value for ∆°H < 0 i.e. negative, and ∆°S > 0 i.e. , positive
Now ,
∆°G = ∆°H -T∆°S
= ( - ∆°H ) - T( + ∆°S )
= ( - ∆°H ) - T( ∆°S )
∆°G = negative
Hence ,
Δ°G < 0 , the reaction is Spontaneous .
Ответ:
C
Explanation:
I just think it is the right answer :) Sorry if I am wrong..