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The hydrates of the salts lose water at different temperatures during decomposition. [12] For example, in the trihydrate MgCO 3 ·3H 2 O, which molecular formula may be written as Mg(HCO 3)(OH)·2H 2 O, the dehydration steps occur at 157 °C and 179 °C as follows: [12] Mg(HCO 3)(OH)·2(H 2 O) → Mg(HCO 3)(OH)·(H 2 O) + H 2 O at 157 °C
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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 .
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%). B Calculated values *Derived data by calculation.
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Typically, a molecular solid is ductile when it has isotropic intermolecular interactions. This allows for dislocation between layers of the crystal much like metals. [5] [8] [11] For example, plastic crystals are soft, resemble waxes and are easily deformed. One example of a ductile molecular solid, that can be bent 180°, is hexachlorobenzene ...
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 ...
It has a eutectic point with water at −3.9 °C and 17.3% (mass) of MgSO 4. [7] Large crystals can be obtained from solutions of the proper concentration kept at 0 °C for a few days. [7] At pressures of about 0.9 GPa and at 240 K, meridianiite decomposes into a mixture of ice VI and the enneahydrate MgSO 4 ·9H 2 O. [9]