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Calculate the $\Delta S_{\text {soln }}^{\circ}$ for the following processes:(a) $\mathrm{NH}_{4} \mathrm{NO}_{3}(s) \longrightarrow \mathrm{NH}_{4}^{+}(a q)+\mathrm{NO}_{3}^{-}(a q)$ and(b) $\mathrm{FeCl}_{3}(s) \longrightarrow \mathrm{Fe}^{3+}(a q)+3 \mathrm{Cl}^{-}(a q) .$ Give a qualitative explanation for the signs.

$$\Delta S_{r x n}^{0}=108.2 \frac{J}{K m o l}$$$$\Delta S_{r x n}^{0}=-266.1 \frac{J}{K m o l}$$

Chemistry 102

Chapter 17

Entropy, Free Energy, and Equilibrium

Thermodynamics

Carleton College

University of Central Florida

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.

Consider the reaction$…

11:42

Use the $S^{\circ}$ values…

01:22

05:27

Calculate $\Delta S^{\circ…

04:02

03:29

Using values of $\Delta_{f…

07:40

Calculate the $K_{\mathrm{…

01:48

solution for part a three chemical reaction is the flowing here. NH four in a three ammonium nitrate in solace take and the production are NH four Positive make wasteful plus e nutri Negative in egg Wasteful. Uh huh. Near delta isnot change in entropy Off energy fall in a tree is equal to 151 Joel per kilo Permal and Delta isnot NH four positive is equal to 112.8 Joel her kilo Her mall I just an delta isnot in a three negative is equal to 146.4 The last minute joy per kilo Permal way will calculate these tendered entropy for the previous reaction by subtracting the entropy of products from the entropy of t react end. So here we used the formula Delta changing entropy off. The reaction Yeah, is equal to Delta s not F product minus delta is not f Dr React tens. So here we have. Uh huh. Delta isnot off. The reaction is, it went to Delta Edge is equal to It's not a into energy for positive. Plus delta isnot f into in a tree negative minus delta s f into any four in a tree. Okay. Yeah. Delta isnot off. Direction is equal to by putting may use 112.8 Joel her killed Permal 146.4 Joel Her caper mall minus 151 Joel per k for moat. Yeah, Delta isnot off. The reaction is equal to 108.2 Joel per k for more? Uh, yeah solution for part B the the chemical reaction is deploying. If e c l free in solid form E three positive in egg was form plus three c l negative in egg was form. So here change in trophy off E C and three is able to run for 2.3. Joel Burke, a Permal, I think. And Delta s not e three positive. Is it well to minus 293.3 Joel Perk a caramel and delta isnot cl negative is equal to 56.5 Jules per K per month. They will calculate this standard entropy party Previous reaction by subtracting the entropy of the reacting from the entropy ity product. So here we have to calculate Theo entropy bell tha iss not The reaction is equal to delta isnot if product minus delta Changing entropy off f after react end. So by putting values here Uh huh. Here, behave. Delta is not off. Duration is equal to Delta. Edge is equal to is not if in due e three positive plus three into Delta is not if into cl negative minus delta isnot if if you see and three Uh huh. So here Delta is not off. The reaction is equal to minus 293.3 Joel Parquet Permal plus three into 56.5 Joel Park a Perma minus one for 2.3. Joel per K. Permal Delta is not off. The reaction is equal to minus 266.1 Joel Per K Permal

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