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Chemistry • Grams to Moles Calculator

Grams to Moles Calculator

Convert a mass in grams to moles (or vice versa) for any chemical formula using its 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

Grams to Moles Conversion Mathematics

Grams to moles calculator converts a mass in grams to moles (or moles to grams) for any chemical formula using its molar mass.

Standardized Mathematical Formula
n = m / M

The mole is chemistry's counting unit for atoms and molecules. Dividing a substance's mass by its molar mass (grams per mole) converts a weighable quantity into the number of moles — the unit used in stoichiometric reaction equations.

Variables:
n:Amount of substance, in moles (mol)
m:Mass of the sample, in grams
M:Molar mass of the compound, in g/mol
How It Works (Step-by-Step)
  • 1Enter the chemical formula (e.g. C6H12O6 for glucose).
  • 2Enter the mass in grams.
  • 3View the amount of substance in moles, using the formula's calculated molar mass.
Real-World Numerical Example
90 Grams of Glucose (C₆H₁₂O₆)

Find the number of moles in 90 grams of glucose.

•Molar mass of C₆H₁₂O₆: (6×12.011) + (12×1.008) + (6×15.999) = 180.156 g/mol.
•Moles: 90 ÷ 180.156 ≈ 0.4996 mol.
Result: 90 grams of glucose is approximately 0.4996 moles (essentially half a mole).
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) — atoms, molecules, or ions. It lets chemists work with countable reaction ratios instead of unmanageably large particle counts.

Rearrange the formula to m = n × M — multiply the number of moles by the molar mass to get the mass in grams.

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