Input interpretation
2, 2, 4-trimethylpentane
Chemical names and formulas
formula | (CH_3)_2CHCH_2C(CH_3)_3 Hill formula | C_8H_18 name | 2, 2, 4-trimethylpentane alternate names | isobutyltrimethylmethane | isooctane | pentane, 2, 2, 4-trimethyl- mass fractions | C (carbon) 84.1% | H (hydrogen) 15.9%
Lewis structure
Draw the Lewis structure of 2, 2, 4-trimethylpentane. 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: 8 n_C, val + 18 n_H, val = 50 Calculate the number of electrons needed to completely fill the valence shells for carbon (n_C, full = 8) and hydrogen (n_H, full = 2): 8 n_C, full + 18 n_H, full = 100 Subtracting these two numbers shows that 100 - 50 = 50 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 25 bonds and hence 50 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 50 - 50 = 0 electrons left to draw and the diagram is complete: Answer: | |
3D structure
3D structure
Basic properties
molar mass | 114.23 g/mol phase | liquid (at STP) melting point | -107 °C boiling point | 98.5 °C density | 0.692 g/cm^3 solubility in water | insoluble
Units
Liquid properties (at STP)
density | 0.692 g/cm^3 vapor pressure | 40.99 mmHg dynamic viscosity | 4.8×10^-4 Pa s (at 25 °C) surface tension | 0.0162 N/m refractive index | 1.391
Units
Thermodynamic properties
specific heat capacity c_p | liquid | 2.093 J/(g K) molar heat capacity c_p | liquid | 239.1 J/(mol K) specific heat of formation Δ_fH° | gas | -1.961 kJ/g molar heat of formation Δ_fH° | gas | -224 kJ/mol molar heat of vaporization | 35.15 kJ/mol | specific heat of vaporization | 0.3077 kJ/g | molar heat of fusion | 9.2 kJ/mol | specific heat of fusion | 0.081 kJ/g | critical temperature | 544 K | critical pressure | 2.57 MPa | (at STP)
Chemical identifiers
CAS number | 540-84-1 Beilstein number | 1696876 PubChem CID number | 10907 PubChem SID number | 24855659 SMILES identifier | CC(C)CC(C)(C)C InChI identifier | InChI=1/C8H18/c1-7(2)6-8(3, 4)5/h7H, 6H2, 1-5H3 RTECS number | SA3320000 MDL number | MFCD00008943
NFPA label
NFPA label
NFPA health rating | 1 NFPA fire rating | 3 NFPA reactivity rating | 0
Safety properties
flash point | -12 °C autoignition point | 410 °C lower explosive limit | 1% (concentration in air) upper explosive limit | 6% (concentration in air)
DOT hazard class | 3 DOT numbers | 1262
Toxicity properties
RTECS classes | mutagen