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Chemistry • Moles Calculator

Moles Calculator

Calculate the number of moles from a substance's mass and molar mass.

Amount of Substance (n = m / M)
0.4996 mol
Molar mass of C6H12O6: 180.156 g/mol
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Calculation Guide & Reference

Moles Calculation Mathematics

Moles calculator computes the number of moles of a substance from its mass and molar mass.

Standardized Mathematical Formula
n = m ÷ M

The number of moles equals the substance's mass divided by its molar mass — the mass of exactly one mole of that substance, in grams per mole.

Variables:
m:Mass of the substance, in grams
M:Molar mass of the substance, in g/mol
How It Works (Step-by-Step)
  • 1Enter the chemical formula to compute its molar mass.
  • 2Enter the mass of the sample in grams.
  • 3View the number of moles.
Real-World Numerical Example
90 Grams of Glucose (C₆H₁₂O₆)

A sample contains 90 grams of glucose (C₆H₁₂O₆, molar mass 180.16 g/mol).

•n = 90 ÷ 180.16 ≈ 0.4996 mol.
Result: The sample contains approximately 0.5 moles of glucose.
Calculation Best Practices & Tips
Ensure solute mass is converted to moles (moles = mass / molar mass) before computing molarity with volume in liters.
Always add acid to water (never water to acid) when preparing aqueous dilutions.

Frequently Asked Questions (FAQ)

A mole is a unit representing exactly 6.022×10²³ particles (Avogadro's number) — it lets chemists count atoms and molecules indirectly by weighing a measurable mass.

Molar mass is the sum of the atomic masses of every atom in the chemical formula, taken from the periodic table, expressed in grams per mole.

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