What is the difference between molar mass and molecular mass
Both are numerically same, ie has same value.
Molar mass is mass of 1 mole of a substance.It can be used for both atoms/molecules.
Example, molar mass of H atom is mass of 1 mole of H = 1 g
Similarly, molar mass of water is 18g
Molecular mass is mass of 1 molecule, expressed in amu. It is used for molecules only. For atoms we have atomic mass. Atomic mass of H is 1 amu. Similarly,,molecular weight/mass of water is 1 amu Difference 1. The Units
We generally use amu ( atomic mass unit) or u (unified mass) while talking about mass of atoms, molecules and ions.(molecular mass/atomic mass)
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 (the inverse of Avogadro’s number)
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.
Molar mass is the mass of 1 mole of molecules of that element.
For example, Molar mass of hydrogen is 1 g, This means that 1 mole of hydrogen atoms will have mass around 1 g.
Note: In many formulae, you may find the following terms interchanged: Atomic mass, Molecular mass, Formula mass and Molar mass. For quick response, just remember that molar mass is atomic mass or molecular mass in grams.
Molar mass is mass of 1 mole of a substance.It can be used for both atoms/molecules.
Example, molar mass of H atom is mass of 1 mole of H = 1 g
Similarly, molar mass of water is 18g
Molecular mass is mass of 1 molecule, expressed in amu. It is used for molecules only. For atoms we have atomic mass. Atomic mass of H is 1 amu. Similarly,,molecular weight/mass of water is 1 amu
Difference 1. The Units
We generally use amu ( atomic mass unit) or u (unified mass) while talking about mass of atoms, molecules and ions.(molecular mass/atomic mass)
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 (the inverse of Avogadro’s number)
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.
Molar mass is the mass of 1 mole of molecules of that element.
For example, Molar mass of hydrogen is 1 g, This means that 1 mole of hydrogen atoms will have mass around 1 g.
Note: In many formulae, you may find the following terms interchanged: Atomic mass, Molecular mass, Formula mass and Molar mass. For quick response, just remember that molar mass is atomic mass or molecular mass in grams.
