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Moles Calculator (Mass ↔ Moles ↔ Molecular Weight)

What Is a Mole in Chemistry?

A mole is a fundamental unit in chemistry used to measure the amount of a substance. One mole contains 6.022 × 10²³ particles (atoms, molecules, or ions), a value known as Avogadro’s Number.

The mole allows chemists to convert between mass, number of particles, and molecular weight, making chemical calculations practical and precise.

Finding Moles
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Finding Mass
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Finding Molecular Weight
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What Is a Moles Calculator?

A Moles Calculator is an online tool that helps you calculate:

  • Moles from mass and molecular weight
  • Mass from moles and molecular weight
  • Molecular weight from mass and moles

You simply enter the known values, select the appropriate units, and the calculator instantly provides accurate results.

How Does the Moles Calculator Work?

This calculator operates using three core chemical relationships:

  1. Finding Mass
  2. Finding Moles
  3. Finding Molecular Weight

If one value is unknown, the calculator determines it using the other two values.

Finding Mass

Use this option when mass is unknown, but moles and molecular weight are known.

Formula:

Mass = (Moles × Molecular Weight) ÷ 1000

Example:

Moles = 15
Molecular Weight = 30 g/mol

Mass = (15 × 30) ÷ 1000
Mass = 0.45 kg

How to Find Moles (Calculate Moles)

Use this option when moles are unknown, but mass and molecular weight are known.

Formula:

Moles = (Mass ÷ Molecular Weight) × 1000

Example:

Mass = 35.2 g
Molecular Weight = 101.6 g/mol

Moles = (35.2 ÷ 101.6) × 1000
Moles = 346.46 mol

Finding Molecular Weight

Use this option when the molecular weight is unknown, but mass and moles are known.

Formula:

Molecular Weight = (Mass ÷ Moles) × 1000

Example:

Mass = 33.6 g
Moles = 38.9

Molecular Weight = (33.6 ÷ 38.9) × 1000
Molecular Weight = 863.75 g/mol

Why Use This Moles Calculator?

This tool eliminates manual calculation errors and saves time when solving chemistry problems involving stoichiometry, solution preparation, and laboratory analysis.

Whether you’re working on homework, lab work, or exam preparation, this calculator ensures precision and clarity.

Features of the Moles Calculator

✔ No registration required

✔ Supports multiple unit conversions

✔ Instant and accurate results

✔ Easy-to-use interface

✔ Ideal for students, teachers, and professionals