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Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules2 Marks
Question
How formula unit mass is different from molecular mass?
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Answer

Formula mass
Molecular mass
Formula mass is the sum of the masses of atoms present in the empirical formula
Molecular mass of a molecule is the mass of a mole of that molecule
Calculated from amu units
Calculated from g/mol units
Calculated using the empirical formula
Calculated using the molecular formula
May or may not give the exact mass of a molecule
Always give the exact mass of a mole of molecules

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