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Use our free Grams to Moles Calculator to instantly convert grams into moles with clear steps and formulas. Perfect for chemistry students and professionals.
Understanding how to convert grams to moles is one of the most fundamental concepts in chemistry. Whether you’re a student, teacher, or chemistry enthusiast, our Grams to Moles Calculator makes the conversion process fast and accurate. This tool is especially useful for solving stoichiometry problems, lab calculations, or preparing for exams.
By simply entering the mass of a substance in grams and its molar mass, the calculator gives you the number of moles instantly, along with step-by-step calculations.
In chemistry, a mole is a unit that measures the amount of substance. One mole contains 6.022 x 10²³ particles, which could be atoms, molecules, ions, or electrons—this number is known as Avogadro’s Number. It helps chemists count particles in a given sample without dealing with extremely large numbers.
For example:
To convert grams to moles, you need two pieces of information:
Grams to Moles Formula:
Moles = Mass (in grams) ÷ Molar Mass (g/mol)
Q: How many moles are there in 25 grams of magnesium (Mg)?
Moles = 25 ÷ 24.305 = 1.029 moles
| Substance | Mass (g) | Molar Mass (g/mol) | Moles |
|---|---|---|---|
| Water (H₂O) | 18 | 18.015 | 1 |
| Sodium (Na) | 23 | 22.990 | 1.004 |
| Magnesium (Mg) | 25 | 24.305 | 1.029 |
| Carbon Dioxide | 44 | 44.01 | 1.00 |
| Glucose (C₆H₁₂O₆) | 180 | 180.16 | 0.999 |
Our Grams to Moles Calculator is designed for ease of use:
It works for elements, compounds, or molecules.
Moles to Molecules:
Molecules = Moles × Avogadro’s Number (6.022 x 10²³)
Moles to Atoms:
Atoms = Moles × Avogadro’s Number (for individual elements)
Grams to Molecules:
Step 1: Convert grams to moles
Step 2: Multiply moles by Avogadro’s Number
Mmol to Grams:
Grams = (mmol × Molar Mass) ÷ 1000
The Grams to Moles Calculator is a must-have tool for chemistry learners and professionals. Whether you’re working on stoichiometry, preparing a lab report, or doing homework, this calculator can save you time and ensure accurate results. It supports complex compounds and elements like magnesium, glucose, or even large biomolecules.
No more confusing math just input the values and get instant, precise answers with a detailed explanation. You can also use this as a stoichiometry calculator, or to convert between moles, molecules, and atoms.
Divide the mass of the substance by its molar mass using the formula:
Moles = grams ÷ molar mass
It depends on the substance. For example, 1 mole of water weighs 18.015 grams, while 1 mole of sodium weighs 22.990 grams.
The molar mass is the weight of one mole of a substance, usually in grams per mole (g/mol). It’s found by adding the atomic masses of each atom in a molecule.
First, find the molar mass of the substance. Then use the formula:
Moles = 25 ÷ Molar Mass
Yes! Just make sure you enter the correct molar mass of the compound.