6. Below is the phase diagram of carbon dioxide. Describe what takes place durin
ID: 490346 • Letter: 6
Question
6. Below is the phase diagram of carbon dioxide. Describe what takes place during the following cycle of changes, starting at 1.0 bar and 200 K: (a) isothermal compression to 70 bar; (b) isobaric (constant pressure) heating to 310 K; (c) further isothermal compression to 80 bar; (d) isobaric cooling to 190 K; (e) isothermal decompression to 1.0 bar; (f) isobaric heating to 200 K.
7. Estimate the boiling point of n-butane, given that its vapor pressure is 8.00 kPa at -52.8°C and 53.3 kPa at -16.3°C.
728 bar Solid 304 K Liquid 5.11 bar 217 K 67 bar 1 bar 298 K 195 K Gas TemperatureExplanation / Answer
6. (a) isothermal compression to 70 bar results in the deposition or desublimation i.e., the gas transforms into solid without passing through the liquid phase.
(b) isobaric (constant pressure) heating to 310 K leads to an increased temperature of the gas.
(c) The condensation of the gas takes place transforming it into a liquid on further isothermal compression to 80 bar
(d) Isobaric cooling to 190 K results in solidification of liquid.
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