![]() ![]() ![]() The final number that we get for the entropy change of boiling water at 25 C, (while not technically possible) is still a real value, and its a larger increase in entropy if we were to do it at this temperature than if we waited until it were already 100C. Calculate the change in entropy that occurs in the system when 1.00 mole of diethyl ether (C4H10O) condenses from a gas to a liquid at its normal boiling. If we are doing good book keeping then we can follow along entropically as we tell this strange and truly hypothetical story. It would only be a liquid when we cooled it back down if we also adding the entropy change of condensing the vapor back into a liquid, but we don't in this case because we want to know the entropy change of vaporization into a gas phase at 25 C. The vibrational frequencies of alicyclic ring systems, J. We know its still a vapor because we told the math to keep it a vapor. , The heat capacity and entropy, heats of transition, fusion and vaporization and the vapor pressures of cyclohexane. Obviously this is not something that is practically possible as you've mentioned, but we can still ask ourselves hypothetically what that change in entropy would look like, if it were possible.īecause entropy is a state function, we get to do cool things like hypothetically heat it up to its normal boiling point at 100C, vaporize it, then cool it back down to 25C while still a vapor. In this process, the substance gains more freedom of movement as it transitions from a more ordered solid state to a less ordered liquid state. We can think of the entropy change of water boiling at 25C and 1 bar as sort of a hypothetical construct of what the entropy change would be if we could vaporize water at standard conditions. ![]()
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