Molar Mass from Molecular Formula

Calculate molar mass by summing atomic masses from the molecular formula. e.g. H₂O = 2(1.008) + 15.999 = 18.015 g/mol.

 
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Physical Constants Reference
ConstantSymbolValue
Speed of lightc2.99792458×10⁸
Planck's constanth6.62607015×10⁻³‴
Boltzmann constant1.380649×10⁻²³
Avogadro's numberNₐ6.02214076×10²³
Gravitational constantG6.6743×10⁻¹¹
Gas constantR8.31446
Elementary chargee1.602176634×10⁻¹⁹
Electron massmₑ9.1093837015×10⁻³¹
Proton massmₚ1.67262192369×10⁻²⁷
Fine-structure constantα7.2973525693×10⁻³
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How It Works

Calculate molar mass by summing atomic masses from the molecular formula. e.g. H₂O = 2(1.008) + 15.999 = 18.015 g/mol

Each component has a specific meaning:

  • Molecular formula — The molecular formula recorded for the patient or scenario being assessed.

Note: Interpret the molar mass result against the clinical thresholds and context described above.

How to Use

Enter the molecular formula for the patient or scenario you are assessing. Calculate molar mass by summing atomic masses from the molecular formula. e.g. H₂O = 2(1.008) + 15.999 = 18.015 g/mol. Use the molar mass result to inform your clinical assessment.

Frequently Asked Questions