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The most common magnesium carbonate forms are the anhydrous salt called magnesite (MgCO 3), and the di, tri, and pentahydrates known as barringtonite (MgCO 3 ·2H 2 O), nesquehonite (MgCO 3 ·3H 2 O), and lansfordite (MgCO 3 ·5H 2 O), respectively. [6]
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Molecular weight (M.W.) (for molecular compounds) and formula weight (F.W.) (for non-molecular compounds), are older terms for what is now more correctly called the relative molar mass (M r). [8] This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant .
Magnesium is the eighth-most-abundant element in the Earth's crust by mass and tied in seventh place with iron in molarity. [13] It is found in large deposits of magnesite , dolomite , and other minerals , and in mineral waters, where magnesium ion is soluble.
The following list has substances known to be gases, but with an unknown boiling point. Fluoroamine; Trifluoromethyl trifluoroethyl trioxide CF 3 OOOCF 2 CF 3 boils between 10 and 20° [142]
Isotopically substituted molecules have higher mass. As a consequence, molecular vibration reduces and the molecule develops a lower zero point energy (see Kinetic isotope effect). The abundances of certain bonds in certain molecules are sensitive to temperature at which it formed (e.g., abundance of 13 C 16 O 18 O in carbonates [29] as 13 C-18 ...
The terms "molecular mass", "molecular weight", and "molar mass" may be used interchangeably in less formal contexts where unit- and quantity-correctness is not needed. The molecular mass is more commonly used when referring to the mass of a single or specific well-defined molecule and less commonly than molecular weight when referring to a ...