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Solid ethane exists in several modifications. [12] On cooling under normal pressure, the first modification to appear is a plastic crystal , crystallizing in the cubic system. In this form, the positions of the hydrogen atoms are not fixed; the molecules may rotate freely around the long axis.
Liquid carbon dioxide is a type of liquid which is formed from highly compressed and cooled gaseous carbon dioxide. It does not form under atmospheric conditions. It only exists when the pressure is above 5.1 atm and the temperature is under 31.1 °C (88.0 °F) (temperature of critical point ) and above −56.6 °C (−69.9 °F) (temperature of ...
The commonly known phases solid, liquid and vapor are separated by phase boundaries, i.e. pressure–temperature combinations where two phases can coexist. At the triple point, all three phases can coexist. However, the liquid–vapor boundary terminates in an endpoint at some critical temperature T c and critical pressure p c. This is the ...
crystal I → liquid 79.87 J/(mol·K) at −89.0 °C Std enthalpy change of state transition, Δ trs H o crystal II → crystal I 2.282 kJ/mol at −183.3 °C Std entropy change of state transition, Δ trs S o crystal II → crystal I 25.48 kJ/mol at −183.3 °C Solid properties Std enthalpy change of formation, Δ f H o solid? kJ/mol Standard ...
Carbon Solid C 0 Carbon Solid C 1.9 Carbon: Gas C 716.67 Carbon dioxide: Gas CO 2: −393.509 Carbon disulfide: Liquid CS 2: 89.41 Carbon disulfide: Gas CS 2: 116.7 Carbon monoxide: Gas CO −110.525 Carbonyl chloride Gas COCl 2: −218.8 Carbon dioxide (un–ionized) Aqueous CO 2 (aq) −419.26 Bicarbonate ion Aqueous HCO 3 – −689.93
Boiling liquid oxygen. This is a list of gases at standard conditions, ... Carbon dioxide: CO 2: ... Pentafluoro(trifluoromethoxy)ethane [52] C 2 F 5 OCF 3: −23.6 204
Carbon dioxide density-pressure phase diagram. Figures 1 and 2 show two-dimensional projections of a phase diagram. In the pressure-temperature phase diagram (Fig. 1) the boiling curve separates the gas and liquid region and ends in the critical point, where the liquid and gas phases disappear to become a single supercritical phase.
Solid carbon dioxide is always below −78.5 °C (−109.3 °F) at regular atmospheric pressure, regardless of the air temperature. Liquid carbon dioxide (industry nomenclature R744 or R-744) was used as a refrigerant prior to the use of dichlorodifluoromethane (R12, a chlorofluorocarbon (CFC) compound). [138]