For elements with no stable isotopes, the mass number of the isotope with the longest. Related: Molecular weights of amino acids 8 O Oxygen 15.999 9 F Fluorine 18.998 10 Ne Neon 20.180. Weights of atoms and isotopes are from NIST article. Molar mass ( molar weight) is the mass of one mole of a substance and is expressed in g/mol.(1 u is equal to 1/12 the mass of one atom of carbon-12) Molecular mass ( molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u).To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.Įxamples of molecular weight computations:ĭefinitions of molecular mass, molecular weight, molar mass and molar weight Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.Ĭomputing molecular weight (molecular mass) Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg.
Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al. Hydrocarbon combustion also contributes to climate change by producing emissions such as carbon dioxide.Computing molar mass (molar weight)To calculate molar mass of a chemical compound enter its formula and click 'Compute'.
Fossil fuel combustion supplies around 95% of the world's primary energy. All three components (fuel, oxidant, energy) must be present for the combustion reaction to occur.Ĭombustion of fossil fuels such as methane, shown in Figure 2 below, produces carbon dioxide, water vapour, and energy. The third component of combustion is a "boost" of energy needed in order to start the reaction - the activation energy. Combustion is the reaction of a compound (the fuel) with an oxidant (which is usually molecular oxygen) to produce oxides. Molecular oxygen is important for combustion - especially in the combustion of fuels for energy. Some physical properties of molecular oxygen:
Oxygen is also important in creating many chemical feedstocks, such as ethylene oxide. Oxygen (as a compressed gas) is also used widely in welding and metal cutting, and as an oxidizer in rocket engines. Molar mass of O2 (g) is 31.99880 0.00060 g/mol Get control of 2022 Track your food intake, exercise, sleep and meditation for free. Industrially, oxygen is used to remove sulfur and carbon impurities during smelting. Molecular oxygen is provided therapeutically in oxygen therapy and hyperbaric chambers, and is also included in breathing gas for space exploration and SCUBA diving. Since animals (including humans) breathe molecular oxygen and require it for metabolism, it is important medically. We rely on photosynthesis of plants to replenish the molecular oxygen in the atmosphere - if photosynthesis stopped, eventually the atmospheric oxygen content would drop to near zero. Molecular oxygen is very chemically reactive, and tends to form oxides by reaction with other elements and compounds quite easily. It's also essential for fossil fuel combustion. Molecular oxygen is essential for life, as it is used for respiration by many organisms. Molecular oxygen (O 2) is a diatomic molecule that is composed of two oxygen atoms held together by a covalent bond. Model of molecular or diatomic oxygen, composed of two oxygen atoms bonded together.
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