Molecular Weight - Gases and Vapours
Molecular mass of common gases and vapors
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The molecular weight of a substance, also called molecular mass, is the mass of one molecule of that substance, relative to the unified atomic mass unit u equal to 1/12 the mass of one atom of carbon-12.
| Gas or Vapor | Molecular Weight |
| Acetylene | 26.04 |
| Air | 28.966 |
| Ammonia | 17.02 |
| Argon | 39.948 |
| Benzene | 78.11 |
| N-Butane | 58.12 |
| Iso-Butane (2-Metyl propane) | 58.12 |
| Butadiene | 54.09 |
| 1-Butene | 56.108 |
| cis -2-Butene | 56.108 |
| trans-2-Butene | 56.108 |
| Isobutene | 56.108 |
| Carbon Dioxide | 44.01 |
| Carbon Disulphide | 76.13 |
| Carbon Monoxide | 28.011 |
| Chlorine | 70.906 |
| Cyclohexane | 84.16 |
| Deuterium | 2.014 |
| Ethane | 30.070 |
| Ethyl Alcohol | 46.07 |
| Ethyl Chloride | 64.515 |
| Ethylene | 28.054 |
| Fluorine | 37.996 |
| Helium | 4.02 |
| N-Heptane | 100.20 |
| Hexane | 86.17 |
| Hydrochloric Acid | 36.47 |
| Hydrogen | 2.016 |
| Hydrogen Chloride | 36.461 |
| Hydrogen Sulfide | 34.076 |
| Krypton | 83.80 |
| Methane | 16.044 |
| Methyl Alcohol | 32.04 |
| Methyl Butane | 72.15 |
| Methyl Chloride | 50.488 |
| Natural Gas | 19.00 |
| Neon | 20.179 |
| Nitric Oxide | 30.006 |
| Nitrogen | 28.0134 |
| Nitrous Oxide | 44.012 |
| N-Octane | 114.22 |
| Oxygen | 31.9988 |
| Ozone | 47.998 |
| N-Pentane | 72.15 |
| Iso-Pentane | 72.15 |
| Propane | 44.097 |
| Propylene | 42.08 |
| R-11 | 137.37 |
| R-12 | 120.92 |
| R-22 | 86.48 |
| R-114 | 170.93 |
| R-123 | 152.93 |
| R-134a | 102.03 |
| R-611 | 60.05 |
| Sulfur | 32.02 |
| Sulfur Dioxide | 64.06 |
| Sulfuric Oxide | 48.1 |
| Toluene | 92.13 |
| Xenon | 131.30 |
| Water Vapor | 18.02 |
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