Mass to Moles Calculator

A mole is the standard chemistry unit for counting atoms and molecules — it links a substance's measurable mass to the actual number of particles it contains. Enter any two of the three fields — Mass (g), Molar Mass (g/mol), and Moles — into the Mass to Moles Calculator to solve for the missing value. Outputs include Calculated Mass, Calculated Moles, Calculated Molar Mass, and the Number of Molecules expressed in scientific notation.

g

Mass of the substance in grams

g/mol

Molecular weight of the substance

mol

Amount of substance in moles

Results

Calculated Mass

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Calculated Moles

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Calculated Molar Mass

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Number of Molecules

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Frequently Asked Questions

What is a mole in chemistry?

A mole is a unit of measurement in chemistry that represents 6.022 × 10²³ particles (atoms, molecules, or ions) of a substance. It's used to connect the microscopic world of atoms to the macroscopic world of grams and provides a way for chemists to count particles by weighing them.

How do you calculate moles from mass and molar mass?

To calculate moles, divide the mass of the substance by its molar mass using the formula: moles = mass (g) / molar mass (g/mol). For example, 10 grams of water with a molar mass of 18.015 g/mol equals 0.555 moles.

What is molar mass and how do you find it?

Molar mass is the mass of one mole of a substance, expressed in g/mol. To find it, add up the atomic weights of all atoms in the molecular formula. For example, water (H₂O) has a molar mass of 18.015 g/mol (2 × 1.008 + 15.999).

How do you convert grams to moles?

To convert grams to moles, divide the mass in grams by the molar mass of the substance. The formula is: moles = mass (g) ÷ molar mass (g/mol). You need to know the chemical formula to determine the molar mass first.

How many grams are in a mole?

The number of grams in a mole depends on the substance and equals its molar mass. For example, one mole of carbon-12 is exactly 12 grams, one mole of water is 18.015 grams, and one mole of sodium chloride is 58.44 grams.

How many atoms or molecules are in a mole?

One mole contains exactly 6.022 × 10²³ particles (Avogadro's number). This could be atoms, molecules, ions, or any other specified particle type. This number is constant regardless of the type of substance.

Can this calculator work with any two known values?

Yes, this calculator can determine the third value when you provide any two of the three variables: mass, molar mass, or moles. Simply enter the known values and the calculator will compute the missing one using the fundamental relationship between these quantities.