A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following
Question
A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following
Solution
The correct statement about the reaction would be: "The reaction is endothermic."
Here's why:
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Spontaneity of a reaction is determined by the sign of the Gibbs Free Energy (ΔG). If ΔG is negative, the reaction is spontaneous; if ΔG is positive, the reaction is non-spontaneous.
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The Gibbs Free Energy is given by the equation ΔG = ΔH - TΔS, where ΔH is the change in enthalpy (heat content), T is the temperature in Kelvin, and ΔS is the change in entropy (disorder).
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If a reaction is non-spontaneous at low temperature but becomes spontaneous at high temperature, it means that the TΔS term is becoming larger than the ΔH term as temperature increases. This implies that ΔS is positive (since increasing temperature makes a positive ΔS more significant).
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However, for ΔG to switch from positive to negative, ΔH must also be positive. This is because a positive ΔH (endothermic reaction, or heat is absorbed) would initially make ΔG positive (non-spontaneous),
Similar Questions
A reaction at 1 bar is non-spontaneous at low temperature but becomes spontaneous at high temperature. Identify the correct statement about the reaction among the following :Both ΔH and ΔS are negativeBoth ΔH and ΔS are positiveΔH is positive while ΔS is negativeΔH is negative while ΔS is positive
For a reaction, H0 = 206 kJ/mol and S0 = 0.215 kJ/(K•mol). At what temperatures is this reaction spontaneous?A.At no temperatureB.At temperatures greater than 958 KC.At all temperaturesD.At temperatures less than 44 K
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At constant pressure and temperature, which statement is true?Group of answer choicesAll reactions for which ΔS < 0 are spontaneous.All reactions for which K < 1 are spontaneous.All reactions for which ΔG < 0 are spontaneous.All reactions for which ΔH < 0 are spontaneous.
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