CHEM 197B Supplemental Instruction Differentiating Characteristics: Phase Behavi

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

1. As we can see, at 20 degree Celsius, the vapour pressures of all the anaesthetics are less than 760mmHg. Hence all the anaesthetics will be in the liquid phase.

Option b

2. At 37 degree Celsius only desflurane has a vapour pressure more that 1atm or 760mmHg.

Hence it will be in the gas phase.

Option b

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