Molar Mass Calculator
Calculate the molar mass (molecular weight) of any chemical compound. Enter a chemical formula to get the molar mass in g/mol with element-wise breakdown and percentage composition.
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Molar Mass of H2SO4
98.077 g/mol
| Element | Atoms | Atomic Mass | Contribution | % |
|---|---|---|---|---|
| H(Hydrogen) | 2 | 1.008 | 2.016 | 2.1% |
| S(Sulphur) | 1 | 32.065 | 32.065 | 32.7% |
| O(Oxygen) | 4 | 15.999 | 63.996 | 65.3% |
Common Compounds
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Example — H₂SO₄ (Sulphuric Acid):
- H: 2 × 1.008 = 2.016 g/mol
- S: 1 × 32.065 = 32.065 g/mol
- O: 4 × 15.999 = 63.996 g/mol
- Total = 2.016 + 32.065 + 63.996 = 98.077 g/mol
Frequently Asked Questions
What is molar mass and why is it important?
Molar mass is the mass of one mole (6.022 × 10²³ particles) of a substance, measured in g/mol. It is essential for stoichiometry — converting between grams and moles in chemical calculations. For example, 1 mole of water (H₂O) weighs 18.015 g.
How do you calculate molar mass from a chemical formula?
Multiply the atomic mass of each element by the number of atoms of that element in the formula, then add all contributions. For H₂SO₄: H = 2 × 1.008 = 2.016, S = 1 × 32.065 = 32.065, O = 4 × 15.999 = 63.996. Total = 98.077 g/mol.
What is the difference between molecular mass and molar mass?
Molecular mass (or molecular weight) is the mass of a single molecule measured in atomic mass units (amu). Molar mass is the mass of one mole of molecules measured in g/mol. Numerically, they are equal — just different units.
Where is molar mass used in board and entrance exams?
Molar mass is used in stoichiometry (CBSE Class 11 Chapter 1), calculating molarity and molality, gas law calculations, percentage composition, empirical and molecular formula determination — all frequently asked in CBSE, JEE, and NEET.