Lab & calculation
Molar mass — মোলার ভর
Quick answer
The mass of one mole (6.022 × 10²³ particles) in grams; numerically equal to the atomic or formula mass — water is 18 g/mol.
Definition
The molar mass of a substance is the mass of one mole of its particles — the mass in grams of 6.022 × 10²³ atoms, molecules or formula units. It is written in g/mol and numerically equals the relative atomic or formula mass: carbon's molar mass is about 12 g/mol, water's about 18 g/mol. Chemists love it because it converts between the scale of single atoms, which we cannot weigh, and grams, which a lab balance reads.
For example
A mole of glucose weighs 180 g, so a 1 M glucose solution needs 180 g topped up to one litre; a mole of carbon is just 12 g of charcoal dust.