Question

what do you mean by molar mass​

Answer 1

$\huge{\boxed{\mathcal{\red{\underline{MOLECULAR\;MASS}}}}}$

✒ The molecular mass of a substance is the sum of the atomic masses of all the atom present in a molecule of that substance.

✒ This is also called the relative molecular mass and its unit is atomic mass unit (u).

✒ Hence, to calculate the mass of molecule i.e. to calculate the molecular mass, the mass of all atoms present in it are added.

$\large{\mathcal{\red{\underline{EXTRA\;INFO:-}}}}}$

✒ Atomic mass is the mass of an atom relative to 1/12th the mass of C-12, usually expressed in atomic mass units while the molecular mass of a substance is the sum of the atomic masses of all the atoms present in a molecule of that substance.

✒ For example the atomic mass of oxygen is 16u and the atomic mass of hydrogen is 1u.

The molecular mass of H2O is calculated as [(2 x 1)+ 16] = 18u

✒ Molecular mass, symbol M, is a physical property characteristic of a given substance namely it's mass per amount of substance.

✒ The base SI unit for mass is the kilogram and that for amount of substance is the mole. Thus the derived unit for molar mass is Kg/mol.