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silicon tetrabromide

Input interpretation

silicon tetrabromide
silicon tetrabromide

Chemical names and formulas

formula | SiBr_4 Hill formula | Br_4Si name | silicon tetrabromide IUPAC name | tetrabromosilane alternate names | silane, tetrabromo- | silicon(IV) bromide | tetrabromosilane mass fractions | Br (bromine) 91.9% | Si (silicon) 8.08%
formula | SiBr_4 Hill formula | Br_4Si name | silicon tetrabromide IUPAC name | tetrabromosilane alternate names | silane, tetrabromo- | silicon(IV) bromide | tetrabromosilane mass fractions | Br (bromine) 91.9% | Si (silicon) 8.08%

Lewis structure

Draw the Lewis structure of silicon tetrabromide. Start by drawing the overall structure of the molecule: Count the total valence electrons of the bromine (n_Br, val = 7) and silicon (n_Si, val = 4) atoms: 4 n_Br, val + n_Si, val = 32 Calculate the number of electrons needed to completely fill the valence shells for bromine (n_Br, full = 8) and silicon (n_Si, full = 8): 4 n_Br, full + n_Si, full = 40 Subtracting these two numbers shows that 40 - 32 = 8 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 4 bonds and hence 8 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 32 - 8 = 24 electrons left to draw: Answer: | |
Draw the Lewis structure of silicon tetrabromide. Start by drawing the overall structure of the molecule: Count the total valence electrons of the bromine (n_Br, val = 7) and silicon (n_Si, val = 4) atoms: 4 n_Br, val + n_Si, val = 32 Calculate the number of electrons needed to completely fill the valence shells for bromine (n_Br, full = 8) and silicon (n_Si, full = 8): 4 n_Br, full + n_Si, full = 40 Subtracting these two numbers shows that 40 - 32 = 8 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 4 bonds and hence 8 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 32 - 8 = 24 electrons left to draw: Answer: | |

3D structure

3D structure
3D structure

Basic properties

molar mass | 347.7 g/mol phase | liquid (at STP) melting point | 5 °C boiling point | 153 °C density | 2.8 g/cm^3 solubility in water | reacts
molar mass | 347.7 g/mol phase | liquid (at STP) melting point | 5 °C boiling point | 153 °C density | 2.8 g/cm^3 solubility in water | reacts

Units

Liquid properties (at STP)

density | 2.8 g/cm^3 vapor pressure | 4.2 mmHg (at 25 °C) refractive index | 1.5685
density | 2.8 g/cm^3 vapor pressure | 4.2 mmHg (at 25 °C) refractive index | 1.5685

Units

Thermodynamic properties

specific heat capacity c_p | gas | 0.2793 J/(g K) molar heat capacity c_p | gas | 97.1 J/(mol K) specific free energy of formation Δ_fG° | gas | -1.242 kJ/g | liquid | -1.277 kJ/g molar free energy of formation Δ_fG° | gas | -431.8 kJ/mol | liquid | -443.9 kJ/mol specific heat of formation Δ_fH° | gas | -1.195 kJ/g molar heat of formation Δ_fH° | gas | -415.5 kJ/mol molar heat of vaporization | 38.9 kJ/mol | specific heat of vaporization | 0.112 kJ/g | critical temperature | 663 K | (at STP)
specific heat capacity c_p | gas | 0.2793 J/(g K) molar heat capacity c_p | gas | 97.1 J/(mol K) specific free energy of formation Δ_fG° | gas | -1.242 kJ/g | liquid | -1.277 kJ/g molar free energy of formation Δ_fG° | gas | -431.8 kJ/mol | liquid | -443.9 kJ/mol specific heat of formation Δ_fH° | gas | -1.195 kJ/g molar heat of formation Δ_fH° | gas | -415.5 kJ/mol molar heat of vaporization | 38.9 kJ/mol | specific heat of vaporization | 0.112 kJ/g | critical temperature | 663 K | (at STP)

Chemical identifiers

CAS number | 7789-66-4 PubChem CID number | 82247 PubChem SID number | 24860133 SMILES identifier | [Si](Br)(Br)(Br)Br InChI identifier | InChI=1/Br4Si/c1-5(2, 3)4 MDL number | MFCD00049530
CAS number | 7789-66-4 PubChem CID number | 82247 PubChem SID number | 24860133 SMILES identifier | [Si](Br)(Br)(Br)Br InChI identifier | InChI=1/Br4Si/c1-5(2, 3)4 MDL number | MFCD00049530

NFPA label

NFPA label
NFPA label
NFPA health rating | 3 NFPA fire rating | 0 NFPA reactivity rating | 2 NFPA hazards | water reactive
NFPA health rating | 3 NFPA fire rating | 0 NFPA reactivity rating | 2 NFPA hazards | water reactive

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