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From the values of $\Delta H$ and $\Delta S$, predict which of the following reactions would be spontaneous at $25^{\circ} \mathrm{C}$ :Reaction $\mathrm{A}: \Delta H=10.5 \mathrm{kJ} / \mathrm{mol}, \Delta S=30 \mathrm{J} / \mathrm{K} \cdot \mathrm{mol};$ reaction $\mathrm{B}: \Delta H=1.8 \mathrm{kJ} / \mathrm{mol}, \Delta S=-113 \mathrm{J} / \mathrm{K} \cdot \mathrm{mol}.$ If either of the reactions is nonspontaneous at $25^{\circ} \mathrm{C},$ at what temperature might it become spontaneous?

K=350K

Chemistry 102

Chapter 17

Entropy, Free Energy, and Equilibrium

Thermodynamics

Carleton College

Drexel University

University of Maryland - University College

University of Kentucky

Lectures

00:42

In thermodynamics, the zeroth law of thermodynamics states that if two systems are in thermal equilibrium with a third system, they are also in thermal equilibrium with each other.

01:47

A spontaneous process is one in which the total entropy of the universe increases. In a spontaneous process, the system will move from an ordered state to a disordered state, such as from ice to water, or from a solid to a gas. The concept of spontaneity was introduced by Rudolf Clausius in 1850.

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Okay, Solution for the above problem Here we have a reaction. A You know, Delta G is equal toe Delta H minus T Delta s. This'd is a free energy musical to changing unhealthy minus temperature and changing entropy is equal to we have values. 10500 minus 298 Multiply 30. Joel Permal is equal to the calculated value. Is 1560 Joel Permal? Yeah, Have a on here. The delta T changes mhm say when Delta G is equal to zero on zero is equal to Delta H minus T Delta s auntie is equal to Delta Edge divided by Delta s Is it culture? By putting values we have when 0500 divided by 30 is equal to 3. 50. Tell me, and we have reaching Be right Our hearts on the thanks, Dino Delta G Musical to Delta H minus T Delta ISS is equal to 18 00 minus 2 98 in 2113 Joy Permal is equal to 35500 Joel Permal sins in this case, both are positive. It is not spontaneous it any camp apology? Okay,

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