Question

What is the difference between molar mass and molecular mass? (Class 9 cbse) explain properly in detail. plz

Answer 1

molar mass is mass of one atom where as molecular mass is of molecule

Answer 2

Difference 1. The Units

We generally use amu ( atomic mass unit) or u(unified mass) while talking about mass of atoms, molecules and ions.

On the other hand, We generally use gram (g) per mole when we talk about molar mass.

NOTE : 1 amu=1u = 1.67 * 10^24 g

Difference 2. The Meaning

Mass of an atom is called Atomic mass. And this is the mass of 1 atom of that element (like Hydrogen).

For example the mass of 1 atom of H is 1 amu.

Similarly, Molecular mass is the mass of one molecule of that kind.

For example Molecular mass of Ca(OH)2 is 74 amu.