Gibbs Free Energy Video Lessons

Concept

# Problem: For each of the following reactions, calculate ΔH°rxn, ΔS°rxn, and ΔG°rxn at 25 °C. Express your answer using two significant figures.NH4Cl(s)→HCl(g)+NH3(g)ΔH°rxn=    kJΔS°rxn=    J/K ΔG°rxn=    kJState whether or not the reaction in part E is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 °C?State whether or not the reaction in part E is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 ?The reaction is spontaneous.The reaction can be made spontaneous by raising the temperature.The reaction can be made spontaneous by lowering the temperature.The reaction can not be spontaneous at any temperature.

###### FREE Expert Solution

$\overline{){\mathbf{\Delta G}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta H}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{-}}{\mathbf{T\Delta S}}{{\mathbf{°}}}_{{\mathbf{rxn}}}}$

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###### Problem Details

For each of the following reactions, calculate ΔH°rxn, ΔS°rxn, and ΔG°rxn at 25 °C. Express your answer using two significant figures.

NH4Cl(s)→HCl(g)+NH3(g)

ΔH°rxn=    kJ

ΔS°rxn=    J/K

ΔG°rxn=    kJ

State whether or not the reaction in part E is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 °C?

State whether or not the reaction in part E is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 ?

 The reaction is spontaneous. The reaction can be made spontaneous by raising the temperature. The reaction can be made spontaneous by lowering the temperature. The reaction can not be spontaneous at any temperature.