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Molar mass is the mass of a given substance divided by the amount of that substance, measured in g/mol. For example, the atomic mass of titanium is 47.88 amu or 47.88 g/mol. In 47.88 grams of titanium, there is one mole (6.022 x 10 23 titanium atoms.
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Molecular mass is the mass of an molecule.
it is calculated by adding the mass of each individual atoms of the molecule.
It is expressed in terms of "atomic mass unit"(amu).

For example:
Molecular mass of water(H2O) = 2×1 + 16 = 18 amu
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