The - phase diagram of carbon dioxide has its triple point at and and its critical…

PHYSICS · Subjective · Fermi University Physics · Thermal, Statistical & Complex Systems · Interacting systems, real gases and phase equilibria · Interacting systems, real gases and phase equilibria

Thermal Physics, Ch Phase coexistence and the Clausius-Clapeyron relation

Problem

The

p

T

phase diagram of carbon dioxide has its triple point at

216.6\,\mathrm{K}

and

0.518\,\mathrm{MPa}

and its critical point at

304.1\,\mathrm{K}

and

7.38\,\mathrm{MPa}

. The solid-vapour (sublimation) line runs from the triple point down to lower temperature and pressure and passes through the point

194.7\,\mathrm{K}

0.101\,\mathrm{MPa}

; the melting line rises steeply from the triple point towards higher pressure; the liquid-vapour line runs from the triple point to the critical point. A sealed cylinder holds carbon dioxide at

250\,\mathrm{K}

and

0.100\,\mathrm{MPa}

. Which single phase is present? Give the phase in one word.

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