How can entropy of universe or surroundings be a state function?
2023年5月5日 · For the system, even if we take the irreversible route, we can always calculate it using the reversible route from A to B, so the system entropy is a state function. However, the surroundings entropy change is not negative of the system's entropy change in an irreversible process, meaning that $(\Delta S)_{\text{universe}}\neq 0$ , despite the ...
Does increasing the entropy of a system cause it to absorb heat?
2017年12月29日 · When the Helium-3 enters the Helium-4, that constitutes an increase in entropy. The change in entropy is defined as Heat/Temperature (see below) Rudolf Clausius invented the idea of entropy in such a way that the change in entropy is the ratio of the heat exchanged in any process and the absolute temperature at which that heat is exchanged.
Entropy for a closed system [closed] - Chemistry Stack Exchange
2019年8月25日 · Thus entropy must decrease. But this does not happen since the thermal reservoir's entropy increases and the system consisting of the gas and reservoir, the total entropy change is 0. Note - By taking the gas as the system, we do not meet the requirement of the entropy's definition of having a Closed System. To sum up this :-
Entropy of surroundings and heat - Chemistry Stack Exchange
2017年2月23日 · Apparently the entropy change of a system can be found by $$\mathrm dS=\frac{\mathrm\delta q_\mathrm{rev}}T$$ I am slightly confused about this because I have seen this being used when the temperature of the system and the surroundings are not the same.
Is ΔS of a system related to temperature and change in enthalpy?
2016年6月8日 · The entropy change in the system is the result of the fact that when the system reacts, while it has the same amount of kinetic-vibrational energy, that energy is distributed in a way in which either more of it is in a form that cannot be used to do work (increase in entropy) or in a way that more of it is in a form that can be used to do work ...
entropy - Why does the Second Law of Thermodynamics hold true ...
2017年12月19日 · And there is always a tendency for the system's energy to become more disordered. An example would be diffusion. Where gases diffuse and become more chaotic. And during the expansion of our universe, its entropy increases. So, we interpret that entropy for a spontaneous process increases, till it reaches maximum.
physical chemistry - Entropy change in an adiabatic expansion ...
2015年5月8日 · In calculating the change in entropy of a closed system that has undergone an irreversible process, you need to first focus exclusively on the initial and final equilibrium states. You then need to identify a reversible process path between the exact same pair of …
physical chemistry - Entropy change of surroundings and system ...
2020年5月13日 · $\begingroup$ Regarding separating them: If the process was irreversible, to get the entropy change of the system and the entropy change of the surroundings, we need to devise a path that takes each of them from their initial thermodynamic equilibrium state to their final thermodynamic equilibrium state reversibly. If the original process was ...
physical chemistry - Entropy of the system is different for ...
2023年12月16日 · $\begingroup$ When a system goes from state A to B once reversibly, the other time irreversibly, the system entropy change is the same. What is not the same is the state change and entropy change of the neighborhood. $\endgroup$
Entropy change of system in adiabatic irreversible process
$\begingroup$ To find the entropy change in an adiabatic irreversible process, you need to figure out (i.e., identify) a reversible path between the same pair of initial- and final equilibrium states of the system (any reversible path will suffice) and calculate the integral of dq/T for that path.