Is molecular mass is exactly same …

The Molecular mass and Molar mass are two different terms and should not be confused as implying the same meaning. The Molecular mass of a substance is the sum of the atomic masses of all the atoms present in a molecule of that substance. It is expressed in atomic mass unit (u). Thus, to calculate the molecular mass, the mass of all the atoms present in it are added. For example, Molecular mass of glucose C6H12O6 is = 6 (C) + 12 (H) + 6 (O) = 180 amu. The Molar mass, on the other hand is the mass of one mole (or 6.023 X 1023) particles of that substance. The molar mass of a substance is numerically equal to the atomic mass or the molecular mass of the substance in ‘u’ and is always measured in grams. For example, the molar mass or mass of 6.023 X 1023molecules of glucose is 180g. Similarly, mass of 6.023 X 1023 atoms of sodium or molar mass of sodium is 23g, but its atomic mass is 23u.