Grams to Moles Converter

Convert between grams and moles for any substance using its molar mass, with particle count from Avogadro's number.

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Molar mass must be positive Provide the mass or moles and the molar mass of the substance to convert between grams and moles.

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Chemistry

Convert between grams and moles using molar mass

The grams-to-moles converter translates a mass measurement into a mole quantity (or vice versa) for any substance with a known molar mass. It also calculates the number of particles using Avogadro's number.

The grams-to-moles formula

Moles equal mass divided by molar mass. If you have 36 grams of water (molar mass 18.015 g/mol), you have 36 / 18.015 ≈ 2.0 moles. In the reverse direction, multiplying moles by molar mass gives the mass in grams.

The number of individual particles (atoms, molecules, or formula units) is found by multiplying moles by Avogadro's number: 6.022 × 10²³ particles per mole.

moles = mass (g) / molar mass (g/mol)

Reverse: mass = moles × molar mass.

particles = moles × 6.022 × 10²³

Avogadro's number converts moles to individual particles.

Finding the molar mass

The molar mass is the molecular weight expressed in grams per mole. For elements, it equals the atomic weight on the periodic table. For compounds, sum the atomic weights of all atoms in the formula. Use the molecular weight calculator on this site to find the molar mass of any compound.

Frequently asked questions

How do I convert grams to moles without a calculator?

Divide the mass in grams by the molar mass. For example, 44 g of CO2 (molar mass 44.01 g/mol) is 44 / 44.01 ≈ 1.0 mol.

 What is the difference between moles and molecules?

A mole is a counting unit equal to 6.022 × 10²³ particles. One mole of water contains 6.022 × 10²³ water molecules, just as one dozen contains 12 items.

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