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Ch.19 - Chemical Thermodynamics

Chapter 19, Problem 18c

A system goes from state 1 to state 2 and back to state 1. (c) Suppose the changes in state are reversible processes. Is the work done by the system upon going from state 1 to state 2 the same or different as compared to that upon going from state 2 back to state 1?

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Hello everyone. So in this video we're trying to see if the given statement is true or false. So in the statement we're talking about a reversible process. If you recall a reversible process is one for which we can restore the system to its original condition with no change to the reaction. So then for a reversible reaction, the pathway from State one to State two is going to be the same as the pathway from state two to State One. Right? So with that being said, we have for the work From one going to stage two should be equal to whatever doing the reverse. That would be negative, so negative W and then going from state to back to state one. So that means that the magnitude of work done by the two pathways will be equal to each other. But of course this reaction here, the reverse will be the opposite sign. We have a negative here. So the pathways will have the same magnitude of work. Therefore, the statement given to us in the problem then is true. So this right here is going to be my final answer for this problem. Thank you all so much for watching
Related Practice
Textbook Question

Consider a process in which an ideal gas changes from state 1 to state 2 in such a way that its temperature changes from 300 K to 200 K. (a) Does the temperature change depend on whether the process is reversible or irreversible?

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Textbook Question

Consider a process in which an ideal gas changes from state 1 to state 2 in such a way that its temperature changes from 300 K to 200 K. (b) Is this process isothermal?

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Textbook Question

Consider a process in which an ideal gas changes from state 1 to state 2 in such a way that its temperature changes from 300 K to 200 K. (c) Does the change in the internal energy, ΔE, depend on the particular pathway taken to carry out this change of state?

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Textbook Question
Consider a system consisting of an ice cube. (a) Under what conditions can the ice cube melt reversibly?
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Textbook Question

Indicate whether each statement is true or false. (a) ΔS is a state function. (b) If a system undergoes a reversible change, the entropy of the universe increases. (c) If a system undergoes a reversible process, the change in entropy of the system is exactly matched by an equal and opposite change in the entropy of the surroundings. (d) If a system undergoes a reversible process, the entropy change of the system must be zero.

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Textbook Question

The normal boiling point of Br2(l) is 58.8 °C, and its molar enthalpy of vaporization is ΔHvap = 29.6 kJ/mol. (a) When Br2(l) boils at its normal boiling point, does its entropy increase or decrease?

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