Distinguish between molecular mars
and modr mars.
Answers
Molecular mass is the sum of the masses of the component atoms of a molecule. For most molecules, this mass is in the range of 10ˉ²⁷ to 10ˉ²⁵ kg.
Molar mass is the mass of one mole of some substance; it is expressed in grams per mole
Molar mass is defined as the mass of a given substance divided by the amount of substance. Molar mass can be applied to elements, ions, molecules and other compounds. The unit is g/mol.
The relative molecular mass is the sum of the relative atomic masses of the molecule’s constituents. The unit is dimensionless.
For a given molecule, the molar mass divided by g/mol is equal to the relative molecular mass.
(Or)
The molecular mass is a relative mass of a molecule of a substance ( a compound or an element )measured by the ratio of the mass of one molecule of the substance to the mass of 1/12th part of C atom.
It is a unitless quantity,being the ratio of two masses.
The tiny constant mass of 1/12th part of the mass of C atom is also considered as unit of mass and is known as ‘amu’ or ‘u’.
1u or amu= 1.6×10^-24g= 1/N g
Where N = Avogadro’s Number.
The molecular mass of Carbon dioxide =44
But actual mass of one molecule of carbon dioxide molecule is 44u.
The molar mass of a substance (a compound or an element) is the mass of 1 mole or Avogadro’s number of the molecules of that substance expressed in g/mol unit
The molar mass of carbon dioxide is 44g/mol.
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Answer:
The key difference between molecular mass and formula mass is that the formula mass of a molecule of a compound is the sum of atomic weights of the atoms in its emperical formula while molar mass is the mass of 1 gram mole of substance.