What is formula mass, how it is different from molecular mass
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Formula mass and molecular mass both refer to the mass of a molecule, but they are used in different contexts.
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Formula mass refers to the sum of the atomic masses of all atoms in a compound, whether it’s ionic or molecular. It’s used for ionic compounds, which don’t have distinct molecules but have a repeating formula unit. For example, in NaCl, the formula mass is the sum of the masses of sodium (Na) and chlorine (Cl) atoms.
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Molecular mass is the sum of the atomic masses of all atoms in a molecule. This term is used for covalent compounds, where discrete molecules exist. For example, in H₂O, the molecular mass is the sum of the masses of two hydrogen atoms and one oxygen atom.
In short:
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Formula mass: Used for ionic compounds, the sum of atoms in the formula unit.
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Molecular mass: Used for molecular compounds, the sum of atoms in a molecule.
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Formula mass is the sum of the atomic masses of all atoms in a compound, used for ionic compounds (like NaCl).
Molecular mass is the sum of atomic masses in a molecule, used for molecular compounds (like H₂O).
In short:
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Formula mass = Ionic compounds
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Molecular mass = Molecular compounds
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Formula mass is the total atomic mass of all atoms in an ionic compound (e.g., NaCl).
Molecular mass is the total atomic mass of all atoms in a molecule (e.g., H₂O).
So, formula mass applies to ionic compounds, while molecular mass applies to molecular compounds.
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Formula mass is the sum of the atomic masses of all atoms in an ionic compound (e.g., NaCl).
Molecular mass is the sum of the atomic masses in a molecule (e.g., H₂O).
In short, formula mass is for ionic compounds, and molecular mass is for molecular compounds.
Formula mass is the sum of the atomic masses of all atoms in an ionic compound (e.g., NaCl).
Molecular mass is the sum of the atomic masses in a molecule (e.g., H₂O).
In short, formula mass is for ionic compounds, and molecular mass is for molecular compounds.
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