മോളാർ മാസ്

മോളാർ മാസിന്റെ എസ്ഐ യൂണിറ്റ് കിലോഗ്രാം/മോൾ ആണ്. എന്നാൽ ചരിത്രപരമായ കാരണങ്ങളാൽ മോളാർ മാസ് എപ്പോഴും ഗ്രാം/മോൾ എന്നേ എഴുതാറുള്ളൂ.

ഉദാഹരണത്തിന് ജലത്തിന്റെ മോളാർ മാസ് M(H2O) ≈ 18.01488 g/mol ആണ്.

The molar mass of atoms of an element is given by the Standard atomic weight of the element multiplied by the molar mass constant, M _u = 1 × 10⁻³ kg/mol = 1 g/mol:

M(H) = 1.007 97(7) × 1 g/mol = 1.007 97(7) g/mol
M(S) = 32.065(5) × 1 g/mol = 32.065(5) g/mol
M(Cl) = 35.453(2) × 1 g/mol = 35.453(2) g/mol
M(Fe) = 55.845(2) × 1 g/mol = 55.845(2) g/mol.

Molar mass is closely related to the relative molar mass (M _r) of a compound, to the older term formula weight (F.W.), and to the standard atomic masses of its constituent elements. However, it should be distinguished from the molecular mass (also known as molecular weight), which is the mass of one molecule (of any single isotopic composition) and is not directly related to the atomic mass, the mass of one atom (of any single isotope). The dalton, symbol Da, is also sometimes used as a unit of molar mass, especially in biochemistry, with the definition 1 Da = 1 g/mol, despite the fact that it is strictly a unit of mass (1 Da = 1 u = 1.660 538 921(73)×10⁻²⁷ kg).

Gram atomic mass is another term for the mass, in grams, of one mole of atoms of that element. "Gram atom" is a former term for a mole.

Molecular weight (M.W.) is an older term for what is now more correctly called the relative molar mass (M _r). This is a dimensionless quantity (i.e., a pure number, without units) equal to the molar mass divided by the molar mass constant.

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