CHEM 197B Supplemental Instruction Differentiating Characteristics: Phase Behavi
ID: 714244 • Letter: C
Question
CHEM 197B Supplemental Instruction Differentiating Characteristics: Phase Behavior Homework2 The inhalation anesthetics used in modern medicine are halogenated ethers, which are carbon- based compounds containing at least one C-O-C group and different halogen atoms (e.g., F, Ci). The vapor pressure curves for several of these substances are shown in the graph: 1600 1400 1200 Most medical vaporizers are kept at a constant temperature close to 20 °C and 1 atm (760 mm Hg). What is the stable phase of the anesthetics shown in the graph under these conditions? a) Gas c) Solid 1. 1000 800 600 400 200 b) Liquid d) Supercritical fluid 10 15 20 2 30 35 40 4S S SS 60 Temperature (c) 2. Which of the substances represented in the graph will be a gas at body temperature (37 °C) and 1 atm: a) Isoflurane c) Isoflurane, Halothane, Enflurane, Sevoflurane b) Desflurane d) None of them Denver, the 'mile high city, has an atmospheric pressure of around 0.82 atm. At what temperatures will both Desflurana and lenlurenn vis 3.Explanation / Answer
The graph(lines) shown above basically separate 2 distinct phases of the respective ethers. For every curve, the area above the curve represents the conditions where the ether is liquid and below which it is gas at that Vapor Pressure and Temperature.
To summarize:
Above the curve- liquid
Below the curve-Gas
1) If you locate on the graph 20C and 760mm Hg, you will see that all curves are below that point. This means all those compounds are gaseous.
Correct answer is A.
2)At 37C and 1atm(760mm Hg) , we see that all curves except for that of Desflurane are below it and they represent gaseous state. So Desflurane will be liquid at that T and P and all others will be liquid.
Correct answer is C.
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