Molar Mass Calculator - Calculate Molecular Weight Online
Free online molar mass calculator to calculate molecular weight of chemical compounds. Enter chemical formulas and get accurate molar mass calculations.
Chemical Formula
Use standard chemical notation with subscripts
Molar Mass Results
Enter a chemical formula to calculate molar mass
About Molar Mass Calculator
The Molar Mass Calculator helps you calculate the molecular weight of chemical compounds by analyzing their chemical formulas.
What is Molar Mass?
Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by summing the atomic masses of all atoms in a chemical formula.
How to Use:
- Enter the chemical formula using standard notation
- Use subscripts for atom counts (e.g., H₂O, C₆H₁₂O₆)
- Parentheses indicate groups of atoms
- Numbers after parentheses multiply the entire group
Common Examples:
- H₂O: Water (18.02 g/mol)
- NaCl: Sodium chloride (58.44 g/mol)
- C₆H₁₂O₆: Glucose (180.16 g/mol)
- CaCO₃: Calcium carbonate (100.09 g/mol)
Applications:
- Stoichiometry calculations
- Solution preparation
- Chemical analysis
- Laboratory work
- Chemistry education
Important Notes:
- Atomic masses are based on the periodic table
- Results are rounded to 2 decimal places
- Complex formulas may require careful input
- Isotopic variations are not considered
Note: This calculator uses standard atomic masses from the periodic table. For precise scientific work, consider isotopic composition and significant figures.
Frequently Asked Questions
What is molar mass?
Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by summing the atomic masses of all atoms in a chemical formula.
How do I enter chemical formulas?
Use standard chemical notation with subscripts for atom counts. For example, enter H2O for water, C6H12O6 for glucose, and CaCO3 for calcium carbonate.
What's the difference between molecular weight and molar mass?
Molecular weight refers to the mass of a single molecule, while molar mass refers to the mass of one mole (6.022 × 10²³ molecules) of a substance. They have the same numerical value but different units.
Can I calculate molar mass for ionic compounds?
Yes, the calculator works for both molecular and ionic compounds. Enter the formula as it appears in the compound, such as NaCl for sodium chloride.
How accurate are the calculations?
The calculations use standard atomic masses from the periodic table and are accurate for most purposes. For precise scientific work, consider isotopic composition and significant figures.