Máy tính trọng lượng phân tử

Calculate molecular weight (molar mass) from any chemical formula. Supports parentheses, hydrates, and complex compounds. Free, fast, and easy to use.

Enter Formula

Use proper capitalization: H2O (not h2o). Use · or * for hydrates.

Enter a chemical formula (e.g. H2O, C6H12O6, Ca(OH)2) and click Calculate to get the molecular weight, element breakdown, and step-by-step solution.

Hướng dẫn sử dụng hoàn chỉnh

Trọng lượng phân tử là gì?

Molecular weight (also called molar mass) is the total mass of one mole of a compound, calculated by summing the atomic weights of every atom in its chemical formula. It is expressed in grams per mole (g/mol) and is fundamental to converting between mass and moles in stoichiometry, solution preparation, and analytical chemistry.

Công thức

Trọng lượng phân tử: MW = Σ (Atomic Weight × Count)

Mass %: % = (Element Mass / MW) × 100

Supported Formula Formats

Simple Formulas

H2O, CO2, NaCl, Fe2O3 - chỉ là các phần tử và chỉ số.

Parentheses

Ca(OH)2, Al2(SO4)3 — các nhóm có số nhân.

Hydrates

CuSO4·5H2O — use · or * for dot notation.

Complex Compounds

C8H10N4O2 (caffeine), C9H8O4 (aspirin), v.v.

Common Molecular Weights

• H₂O (Nước) = 18,015 g/mol

• CO₂ (Carbon Dioxide) = 44,009 g/mol

• NaCl (Muối ăn) = 58,443 g/mol

• C₆H₁₂O₆ (Glucose) = 180,156 g/mol

• Ca(OH)₂ (Canxi Hydroxit) = 74,093 g/mol

• C₈H₁₀N₄O₂ (Caffeine) = 194,190 g/mol

• C₂H₅OH (Ethanol) = 46,069 g/mol

Ghi chú quan trọng

  • Element symbols are case-sensitive: Na (sodium) vs NA (invalid).
  • Parentheses must be properly balanced.
  • Trọng lượng nguyên tử là giá trị tiêu chuẩn IUPAC.
  • Mass percentages always sum to 100%.

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