Input interpretation
hydrogen sulfide
Chemical names and formulas
formula | H_2S name | hydrogen sulfide alternate names | sulfane mass fractions | H (hydrogen) 5.92% | S (sulfur) 94.1%
Lewis structure
Draw the Lewis structure of hydrogen sulfide. Start by drawing the overall structure of the molecule: Count the total valence electrons of the hydrogen (n_H, val = 1) and sulfur (n_S, val = 6) atoms: 2 n_H, val + n_S, val = 8 Calculate the number of electrons needed to completely fill the valence shells for hydrogen (n_H, full = 2) and sulfur (n_S, full = 8): 2 n_H, full + n_S, full = 12 Subtracting these two numbers shows that 12 - 8 = 4 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 2 bonds and hence 4 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 8 - 4 = 4 electrons left to draw: Answer: | |
3D structure
3D structure
Basic properties
molar mass | 34.08 g/mol phase | gas (at STP) melting point | -85 °C boiling point | -60 °C density | 0.001393 g/cm^3 (at 25 °C) dielectric constant | 1.003
Gas properties (at STP)
density | 0.001393 g/cm^3 (at 25 °C) vapor density | 1.19 (relative to air) molar volume | 24460 cm^3/mol dynamic viscosity | 1.239×10^-5 Pa s (at 25 °C)
Units
Thermodynamic properties
specific heat capacity c_p | gas | 1.004 J/(g K) molar heat capacity c_p | gas | 34.2 J/(mol K) specific free energy of formation Δ_fG° | gas | -0.9802 kJ/g molar free energy of formation Δ_fG° | gas | -33.4 kJ/mol specific heat of formation Δ_fH° | gas | -0.6045 kJ/g molar heat of formation Δ_fH° | gas | -20.6 kJ/mol specific entropy S° | gas | 6.045 J/(g K) molar entropy S° | gas | 206 J/(mol K) molar heat of vaporization | 17.7 kJ/mol | specific heat of vaporization | 0.5194 kJ/g | molar heat of fusion | 2.38 kJ/mol | specific heat of fusion | 0.0698 kJ/g | thermal conductivity | 0.01373 W/(m K) | critical temperature | 373.1 K | critical pressure | 9 MPa | (at STP)
Phase diagram
Phase diagram
Units
Chemical identifiers
CAS number | 7783-06-4 Beilstein number | 3535004 PubChem CID number | 402 PubChem SID number | 24857784 SMILES identifier | S InChI identifier | InChI=1/H2S/h1H2 RTECS number | MX1225000 MDL number | MFCD00011444
Toxicity properties
short-term exposure limit | 21 mg/m^3
long-term exposure limit | 14 mg/m^3 (over 8 hours)