Bihar Police Constable Model Paper 4

Molar Mass:

• The molar mass is obtained when the mass of a chemical element or chemical compound is divided by the amount of substance (mole). Its unit is grams per mole.
• The molar mass of a compound can be calculated by adding the atomic masses of the constituent atoms.

Mole:

• A mole is a unit of measure that helps us compare particles of any given substance and its mass
• 1 Mole = 6.02214076 × 10²³

The molar mass of NaCl:

1. First of all, find the individual atomic masses of the elements
2. Count the number of atoms for each element.
3. Finally, calculate the molar mass

Na = 1 (22.98 g/mol) = 22.98 g/mol

Cl = 1 (35.45 g/mol) = 35.45 g/mol

Molar mass = 22.98 + 36.45 g/mol

Molar mass = 58.43 g/mol