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Mole Calculator

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Enter any known values to instantly calculate molar relationships 🧪

🔢 Calculator Panel

1 Define Substance

2 Enter Known Values

💡 Use scientific notation e (e.g. 6.02e23)
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📝 Mole Calculation Formulas

The mole bridges microscopic particles and macroscopic mass. Core formula:

Mass (m)
Molar Mass (M)
=
Moles (n)
=
Particles (N)
Avogadro's Number (NA)
  • Moles (n): The SI unit of amount of substance, unit: mol.
  • Mass (m): The actual weight of the substance, unit: grams (g).
  • Molar Mass (M): Mass per mole of substance (g/mol).
  • Avogadro's Number (NA): Approximately 6.022 × 1023 particles/mol.

Steps:

  1. Identify your known values (e.g. the substance, so you can look up molar mass).
  2. Enter the value in the corresponding input field.
  3. The system calculates instantly using Avogadro's law and conservation of mass.

🔬 What is a Mole?

Mole / 莫耳

🧪 Base Unit of Amount

1 mole is defined as the amount containing as many entities as atoms in exactly 12 g of ¹²C. It links microscopic atom counts to macroscopic mass.

Avogadro's Number

🔢 6.022 × 10²³

An astronomical number representing the particle count in 1 mole. Precision matters in semiconductor doping and fine chemistry.

Molar Mass

⚖️ Mass per Mole

Numerically equal to the atomic or molecular weight. Water's molar mass is ~18.015 g/mol, meaning 1 mole of water weighs ~18 g.

STP / NTP

☁️ Gas Volume Relation

At STP (0°C, 1 atm), 1 mole of ideal gas occupies ~22.4 L. Widely used in gas kinetics and stoichiometry.