Input interpretation
2, 2-dimethylbutane
Chemical names and formulas
formula | CH_3CH_2C(CH_3)_3 Hill formula | C_6H_14 name | 2, 2-dimethylbutane alternate names | butane, 2, 2-dimethyl- | dimethylbutane | neohexane mass fractions | C (carbon) 83.6% | H (hydrogen) 16.4%
Lewis structure
Draw the Lewis structure of 2, 2-dimethylbutane. Start by drawing the overall structure of the molecule: Count the total valence electrons of the carbon (n_C, val = 4) and hydrogen (n_H, val = 1) atoms: 6 n_C, val + 14 n_H, val = 38 Calculate the number of electrons needed to completely fill the valence shells for carbon (n_C, full = 8) and hydrogen (n_H, full = 2): 6 n_C, full + 14 n_H, full = 76 Subtracting these two numbers shows that 76 - 38 = 38 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 19 bonds and hence 38 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 38 - 38 = 0 electrons left to draw and the diagram is complete: Answer: | |
3D structure
3D structure
Basic properties
molar mass | 86.18 g/mol phase | liquid (at STP) melting point | -100 °C boiling point | 50 °C density | 0.649 g/cm^3 solubility in water | insoluble
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Liquid properties (at STP)
density | 0.649 g/cm^3 vapor pressure | 276.6 mmHg dynamic viscosity | 4.77×10^-4 Pa s (at 0 °C) surface tension | 0.0182 N/m refractive index | 1.369
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Thermodynamic properties
specific heat capacity c_p | liquid | 2.227 J/(g K) molar heat capacity c_p | liquid | 191.9 J/(mol K) specific heat of formation Δ_fH° | gas | -2.157 kJ/g molar heat of formation Δ_fH° | gas | -185.9 kJ/mol molar heat of vaporization | 27.68 kJ/mol | specific heat of vaporization | 0.3212 kJ/g | molar heat of combustion | 4160 kJ/mol | specific heat of combustion | 48.27 kJ/g | molar heat of fusion | 0.58 kJ/mol | specific heat of fusion | 0.0067 kJ/g | critical temperature | 489.3 K | critical pressure | 3.1 MPa | (at STP)
Chemical identifiers
CAS number | 75-83-2 Beilstein number | 1730736 PubChem CID number | 6403 PubChem SID number | 24893464 SMILES identifier | CCC(C)(C)C InChI identifier | InChI=1/C6H14/c1-5-6(2, 3)4/h5H2, 1-4H3 RTECS number | EJ9300000 MDL number | MFCD00009321
NFPA label
NFPA label
NFPA health rating | 1 NFPA fire rating | 3 NFPA reactivity rating | 0
Safety properties
flash point | -34.44 °C autoignition point | 405 °C lower explosive limit | 1.2% (concentration in air) upper explosive limit | 7% (concentration in air)
DOT hazard class | 3 DOT numbers | 2457
Toxicity properties
threshold limit value | 500 ppmv
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