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Anhydrous MgCl 2 is produced industrially by heating the complex salt named hexamminemagnesium dichloride [Mg(NH 3) 6] 2+ (Cl −) 2. [2] The thermal dehydration of the hydrates MgCl 2 ·nH 2 O (n = 6, 12) does not occur straightforwardly. [8] As suggested by the existence of hydrates, anhydrous MgCl 2 is a Lewis acid, although a weak one.
Carnallite's chemical formula is K Mg Cl 3 ·6(H 2 O). Synthetic carnallite crystal specimens can be produced from 1.5 mole percent KCl and 98.5 mole percent MgCl 2 ·6H 2 O by slow crystallization at 25 °C. [8] Its density is 1.602 g/cm 3. [8] Carnallite can also be produced by grinding the combination of hydrated magnesium chloride and ...
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 .
The molecular mass and relative molecular mass are distinct from but related to the molar mass. The molar mass is defined as the mass of a given substance divided by the amount of the substance , and is expressed in grams per mol (g/mol).
This template calculates the molecular mass (or molar mass) of a chemical compound. It is designed to be embedded in infoboxes ... 207.2 g·mol −1
MnCl 2 Molar mass: 125.844 g/mol (anhydrous) 161.874 g/mol (dihydrate) 197.91 g/mol (tetrahydrate) Appearance pink solid (tetrahydrate) Density: 2.977 g/cm 3 (anhydrous) 2.27 g/cm 3 (dihydrate) 2.01 g/cm 3 (tetrahydrate) Melting point: 654 °C (1,209 °F; 927 K) (anhydrous) dihydrate dehydrates at 135 °C tetrahydrate dehydrates at 58 °C ...
Magnesium perchlorate decomposes at 250 °C. [2] The heat of formation is -568.90 kJ/mol. [ 3 ] The enthalpy of solution is quite high, so reactions are done in large amounts of water to dilute it.
For gases, departure from 3 R per mole of atoms is generally due to two factors: (1) failure of the higher quantum-energy-spaced vibration modes in gas molecules to be excited at room temperature, and (2) loss of potential energy degree of freedom for small gas molecules, simply because most of their atoms are not bonded maximally in space to ...