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Question
Distinguish between molecular mass and molar mass.
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Solution
MOLAR MASS MOLECULAR MASS Refer to mass of a mole of a substance Refer to the mass of molecules Also known as molecular weight It determines the mass of single molecule. SI unit is g/mol to use in higher calculation Measured in amu It is defined as the mass of Avogadro number of atom/molecules or compounds No particular melting point Measurement given to compounds, atoms or molecules Determined only in molecules Less accurate than molecular mass Accurate to use in higher calculations Example: Mass of 1 mole of oxygen is 15.9994 grams. Therefore the molar mass =15.9994g/mol Example : Molecular mass of Ca(OH)2=74 atomic mass units.
atomic mass units
| MOLAR MASS | MOLECULAR MASS |
| Refer to mass of a mole of a substance | Refer to the mass of molecules |
| Also known as molecular weight | It determines the mass of single molecule. |
| SI unit is g/mol to use in higher calculation | Measured in amu |
| It is defined as the mass of Avogadro number of atom/molecules or compounds | No particular melting point |
| Measurement given to compounds, atoms or molecules | Determined only in molecules |
| Less accurate than molecular mass | Accurate to use in higher calculations |
| Example: Mass of 1 mole of oxygen is 15.9994 grams. Therefore the molar mass =15.9994g/mol | Example : Molecular mass of Ca(OH)2=74 atomic mass units. |
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