Chemistry Calculator | Molar Mass & Molecular Weight

📖 How to Use This Chemistry Calculator

Enter a chemical formula - Type the formula (e.g., H2O, NaCl, C6H12O6, Fe2(SO4)3).

Use parentheses - For compounds like Ca(OH)2, use parentheses correctly.

Click "Calculate Molar Mass" - Get instant molar mass with elemental breakdown.

🧪 What is Molar Mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It is numerically equal to the molecular weight (sum of atomic masses of all atoms in the molecule). Molar mass is essential for converting between grams and moles in chemical reactions.

📊 How Molar Mass is Calculated

Molar mass = Sum of (atomic mass of each element × number of atoms of that element)

Example: Water (H₂O) = (2 × 1.008) + (1 × 15.999) = 18.015 g/mol

🔬 Supported Elements

The calculator supports elements up to Barium (atomic number 56), including all common elements: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te, I, Xe, Cs, Ba.

💡 Common Chemical Formulas

H₂O - Water (18.015 g/mol)
NaCl - Sodium chloride / Table salt (58.44 g/mol)
C₆H₁₂O₆ - Glucose (180.16 g/mol)
CO₂ - Carbon dioxide (44.01 g/mol)
H₂SO₄ - Sulfuric acid (98.08 g/mol)
Ca(OH)₂ - Calcium hydroxide (74.09 g/mol)
Fe₂O₃ - Iron(III) oxide / Rust (159.69 g/mol)

❓ Frequently Asked Questions (FAQ)

How do I write chemical formulas correctly?

Write element symbols with proper capitalization (e.g., "NaCl" not "NACL"). Use numbers for subscripts (e.g., "H2O" for H₂O). For compounds with parentheses, use "Ca(OH)2" for calcium hydroxide.

What is the difference between molar mass and molecular weight?

Molar mass and molecular weight are numerically the same, but molar mass is expressed in g/mol, while molecular weight is a dimensionless ratio. Both represent the sum of atomic masses in a molecule.

Why do I need to know molar mass?

Molar mass is essential for converting between grams and moles in chemical reactions, preparing solutions, and calculating limiting reagents. It's a fundamental concept in stoichiometry.

How do I calculate molar mass for hydrates?

For hydrates like CuSO₄·5H₂O, enter "CuSO4.5H2O" or use parentheses. Our calculator correctly handles water of hydration with decimal points.

What are significant figures in molar mass?

Our calculator uses standard atomic masses with up to 4 decimal places. The final result is shown with 4 decimal places for precision.

Does this calculator work for organic compounds?

Yes! It works for any valid chemical formula, including complex organic compounds like C₆H₁₂O₆ (glucose) and C₂H₅OH (ethanol).