Question

Define gram molecular mass of a substance.

Answer 1

Definition of gram molecular mass of substance:

The mass of one mole of a substance equal to the molecular mass in grams is known as the gram molecular mass of the substance.

Example: Gram molecular mass of oxygen:

One mole of oxygen molecule $\left({\mathrm{O}}_2\right)$ is numerically equal to the molecular mass of oxygen $\left(32\mathrm{u}\right)$ in grams. Thus,

$1$ mole ${\mathrm{O}}_2$ =$32\mathrm{g}$ ${\mathrm{O}}_2$

Thus, gram molecular mass of oxygen molecule is = $32\mathrm{g}$.