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Mole Calculator

Choose and enter the values to calculate the quantity of a substance.

Calculate:

Moles:

g ▾

Molecular Mole (g/mol):

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Mole Calculator

Use this mole calculator to find how many moles, molecular weight, and molar mass are required for your experimental measurements.

What Is A Mole?

The mole is a unit used to count amounts of substance, similar to counting units like a pair or a dozen. One mole contains 6.02214076 × 10²³ particles, known as Avogadro’s number or Avogadro’s constant.

Large quantities of very small entities, such as atoms, molecules, or other specified particles, are measured in moles (mol).

Mathematical Equation

The formula used to calculate the number of moles is:

Number of Moles = Mass in grams / Molar Mass

You can perform precise molecular calculations using our mole calculator for efficiency in chemistry studies.

Molecular Weight or Molar Mass

Molecular weight (or molar mass) is the sum of the atomic masses of all atoms in a molecule. It is essential for mole conversions. Calculating manually requires careful use of the periodic table.

For convenience, use the Molar Mass Calculator to quickly determine molar masses and calculate moles.

How to Calculate Moles

Formula:

Number of Moles = Mass of Substance / Molar Mass of Substance

Knowing any two variables allows calculation of the third. You can also convert between grams and moles using our grams to moles calculator or moles to grams calculator:

Mass = Molecular Weight × Number of Moles

Example:

Suppose you have 50 grams of sodium chloride (NaCl). Find how many moles are present.

Step 1: Determine atomic masses:

Sodium (Na) ≈ 22.99 g/mol
Chlorine (Cl) ≈ 35.45 g/mol

Step 2: Calculate molar mass of NaCl:

Molar Mass of NaCl = 22.99 + 35.45 = 58.44 g/mol

Step 3: Calculate number of moles:

Number of Moles of NaCl = 50 / 58.44 ≈ 0.857 moles

Thus, 50 grams of sodium chloride contains approximately 0.857 moles of NaCl.

More complex problems involving larger masses or multiple compounds can also be solved quickly with a mole calculator.

FAQs

How Do You Find Moles Using Avogadro's Number?

To convert moles to molecules: multiply the number of moles by 6.02214076 × 10²³
To convert molecules to moles: divide the number of molecules by 6.02214076 × 10²³

How Many Atoms Are in a Mole?

One mole contains 6.02214076 × 10²³ atoms.

Why Do We Calculate Moles?

Calculating moles determines how many molecules or particles are present in a given mass of a substance. This allows chemists to measure exact reactant amounts and is essential for standardizing concentration in chemistry.

How to Convert Molecules to Moles?

Use the formula:

Moles = Number of molecules / 6.02214076 × 10²³

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