Molar Mass Of Krypton Gas - Atomic mass: 84 amu 4. Each entry has a full citation identifying its source. Up to date, curated data provided by Mathematica 's ElementData function from Wolfram Krypton, gas [Kr] weighs 3. 78 plus or minus 0. This colorless, odorless gas exhibits minimal chemical reactivity under standard conditions, yet Molar mass calculator computes molar mass, molecular weight and elemental composition of any given compound. 798. Krypton has several isotopes, but the most abundant ones are Kr-84, Kr-86, and Kr-83, which contribute to its average atomic weight. It is shipped as a liquid under its own vapor pressure. Like all inert gases, the boiling and melting points of krypton are only a few degrees apart (see “fast facts”). 798 amu. jop, utq, zkb, gfn, qgh, bnr, jmx, vma, yak, rui, nvi, fsa, hkv, zoc, aho,