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.

The molecular mass of a molecule is also called the molar mass. This is because the mass is given per one mole. the formula mass and molecular mass are the same
An example of calculating the molar mass of an ideal gas: A scientist carries out an experiment to determine the molar mass of a 2.84-g sample of a colorless liquid which exerts 756 mmHg pressure when vaporized in a 260-mL flask at 142 o C. What is the molecular mass of this compound? Molecular Weight. Molecules are composed of several atoms, for example a carbon dioxide molecule (CO 2) is made up of 1 carbon atom and 2 oxygen atoms. The molecular weight (or molecular mass or relative molecular mass (RMM)) is the sum of the atomic weights of all the atoms in the molecule. Example 1. Calculate the molecular weight of carbon C12H22O11 molecular weight. Molar mass of C12H22O11 = 342.29648 g/mol. This compound is also known as Lactose or Sucrose or Maltose. Convert grams C12H22O11 to moles. or. moles C12H22O11 to grams. Molecular weight calculation: 12.0107*12 + 1.00794*22 + 15.9994*11.
If its molar mass is 52.46 g/mol, then determine the molecular formula of the compound. Solution: Given data: The empirical formula of a compound = HClO. The molar mass of the compound = 52.46 g/mol. First, let’s calculate the empirical formula molar mass. Empirical formula molar mass (EFM) = 1.00794 + 35.453 + 15.9994 = 52.460 g/mol
We need two pieces of information to do this calculation. We need to know the number of grams in a pound and the molecular weight or molar mass of this sugar. A pound of sugar has a mass of 453.6 grams and one mole of this sugar has a mass of 342.3 grams. A pair of unit factors can be constructed from the molecular weight or molar mass. oEJm.
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    • is molecular mass and molar mass the same