Atomic Mass Calculator
Calculate atomic mass and molecular weight using chemical formulas and isotopic abundances.
How to Use This Calculator
- Enter the chemical formula (e.g., H2O, NaCl)
- For isotopic calculations, select specific isotopes
- Input isotopic abundances if known
- Click Calculate to determine atomic/molecular mass
- Review the detailed mass breakdown by element
Key Concepts
- Atomic Mass Unit (amu) = 1/12 mass of Carbon-12
- Molecular Mass = Sum of atomic masses
- Average Atomic Mass = Σ(isotope mass × abundance)
- Molar Mass (g/mol) = Mass of one mole
Common Elements
- H (Hydrogen): 1.008 amu
- C (Carbon): 12.011 amu
- N (Nitrogen): 14.007 amu
- O (Oxygen): 15.999 amu
- Na (Sodium): 22.990 amu
- Cl (Chlorine): 35.453 amu
Applications
- Chemical Synthesis
- Stoichiometry
- Solution Preparation
- Isotope Analysis
- Mass Spectrometry
Important Considerations
- Natural isotopic variation
- Significant figures in calculations
- Standard atomic weights vs. precise masses
- Environmental effects on measurements
Atomic Mass Calculator
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