Zdroj:https://en.wikipedia.org?pojem=Carbon_dioxide
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Carbon dioxide

Names
IUPAC name Carbon dioxide
Other names Carbonic acid gas Carbonic anhydride Carbonic dioxide Carbonic oxide Carbon(IV) oxide Methanedione R-744 (refrigerant) R744 (refrigerant alternative spelling) Dry ice (solid phase)
Identifiers
CAS Number	124-38-9 Y
3D model (JSmol)	Interactive image Interactive image
3DMet	B01131
Beilstein Reference	1900390
ChEBI	CHEBI:16526 Y
ChEMBL	ChEMBL1231871 N
ChemSpider	274 Y
ECHA InfoCard	100.004.271
EC Number	204-696-9
E number	E290 (preservatives)
Gmelin Reference	989
KEGG	D00004 Y
MeSH	Carbon+dioxide
PubChem CID	280
RTECS number	FF6400000
UNII	142M471B3J Y
UN number	1013 (gas), 1845 (solid)
CompTox Dashboard (EPA)	DTXSID4027028
InChI InChI=1S/CO2/c2-1-3 Y Key: CURLTUGMZLYLDI-UHFFFAOYSA-N Y InChI=1/CO2/c2-1-3 Key: CURLTUGMZLYLDI-UHFFFAOYAO
SMILES O=C=O C(=O)=O
Properties
Chemical formula	CO2
Molar mass	44.009 g·mol−1
Appearance	Colorless gas
Odor	Low concentrations: none High concentrations: sharp; acidic[1]
Density	1562 kg/m3 (solid at 1 atm (100 kPa) and −78.5 °C (−109.3 °F)) 1101 kg/m3 (liquid at saturation −37 °C (−35 °F)) 1.977 kg/m3 (gas at 1 atm (100 kPa) and 0 °C (32 °F))
Critical point (T, P)	304.128(15) K[2] (30.978(15) °C), 7.3773(30) MPa[2] (72.808(30) atm)
Sublimation conditions	194.6855(30) K (−78.4645(30) °C) at 1 atm (0.101325 MPa)
Solubility in water	1.45 g/L at 25 °C (77 °F), 100 kPa (0.99 atm)
Vapor pressure	5.7292(30) MPa, 56.54(30) atm (20 °C (293.15 K))
Acidity (pKa)	Carbonic acid: pKa1 = 3.6 pKa1(apparent) = 6.35 pKa2 = 10.33
Magnetic susceptibility (χ)	−20.5·10−6 cm3/mol
Thermal conductivity	0.01662 W·m−1·K−1 (300 K (27 °C; 80 °F))[3]
Refractive index (nD)	1.00045
Viscosity	14.90 μPa·s at 25 °C (298 K)[4] 70 μPa·s at −78.5 °C (194.7 K)
Dipole moment	0 D
Structure
Crystal structure	Trigonal
Molecular shape	Linear
Thermochemistry
Heat capacity (C)	37.135 J/(K·mol)
Std molar entropy (S⦵298)	214 J·mol−1·K−1
Std enthalpy of formation (ΔfH⦵298)	−393.5 kJ·mol−1
Pharmacology
ATC code	V03AN02 (WHO)
Hazards
NFPA 704 (fire diamond)	[7][8] 2 0 0 SA
Lethal dose or concentration (LD, LC):
LCLo (lowest published)	90,000 ppm (162,000 mg/m3) (human, 5 min)[6]
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 5000 ppm (9000 mg/m3)[5]
REL (Recommended)	TWA 5000 ppm (9000 mg/m3), ST 30,000 ppm (54,000 mg/m3)[5]
IDLH (Immediate danger)	40,000 ppm (72,000 mg/m3)[5]
Safety data sheet (SDS)	Sigma-Aldrich
Related compounds
Other anions	Carbon disulfide Carbon diselenide Carbon ditelluride