Grams per Mole Calculator

Find molar mass using chemical formulas fast. Convert grams, moles, and particles in one form. View element shares, export results, and learn each step.

Calculator Form

Choose the chemistry conversion you want to perform.
Optional for conversion modes if you already know the molar mass.
Use g/mol when no formula is entered.
Needed for grams to moles or grams to particles.
Needed for moles to grams or moles to particles.
Needed for particles to moles.
Controls displayed precision across results and tables.

Formula Used

Molar mass: M = Σ(nᵢ × Aᵢ)

Here, nᵢ is the number of atoms of each element, and Aᵢ is that element’s atomic mass.

Moles from grams: n = m / M

Grams from moles: m = n × M

Particles from moles: N = n × NA

Moles from particles: n = N / NA

In these equations, M is molar mass, m is mass in grams, n is amount in moles, N is particle count, and NA is Avogadro’s constant.

How to Use This Calculator

  1. Select the calculation mode that matches your chemistry task.
  2. Enter a chemical formula if you want the page to compute molar mass automatically.
  3. Enter a known molar mass instead when your compound is already provided in g/mol.
  4. Fill in grams, moles, or particles depending on the selected mode.
  5. Choose the number of significant digits for cleaner reporting.
  6. Press Calculate to show the result above the form.
  7. Review the summary table, graph, and element contribution table.
  8. Use the CSV or PDF buttons to export the result for homework, lab work, or reports.

Example Data Table

Compound Formula Molar Mass (g/mol) Example Input Example Output
Water H2O 18.015 36.03 g 2.000 mol
Carbon Dioxide CO2 44.009 0.500 mol 22.00 g
Sodium Chloride NaCl 58.44 58.44 g 1.000 mol
Glucose C6H12O6 180.156 180.156 g 6.022e23 molecules
Calcium Hydroxide Ca(OH)2 74.092 148.184 g 2.000 mol

Frequently Asked Questions

1) What does grams per mole mean?

Grams per mole tells you how much one mole of a substance weighs. It links the microscopic particle count to a measurable laboratory mass.

2) Can I enter a chemical formula instead of molar mass?

Yes. Entering a valid formula lets the calculator compute molar mass automatically from atomic weights. That is usually the fastest and safest option.

3) Does the parser support parentheses and hydrates?

Yes. The parser handles formulas like Ca(OH)2 and hydrate notation such as CuSO4·5H2O. Square brackets are normalized to parentheses.

4) What is the difference between molar mass and molecular mass?

Molecular mass refers to one molecule or formula unit. Molar mass is the mass of one mole of those units. Their numeric values match, but the units differ.

5) Why does the calculator use Avogadro’s constant?

Avogadro’s constant converts between moles and actual particle counts. One mole always contains 6.02214076 × 10²³ particles.

6) Can I convert grams directly to particles?

Yes. The calculator first finds moles from grams and molar mass, then multiplies by Avogadro’s constant to get particles or molecules.

7) Why are some answers shown in scientific notation?

Scientific notation is used when values become extremely large or very small. It keeps chemistry results easier to read and compare.

8) Why might my answer differ slightly from a textbook value?

Small differences usually come from rounding rules, significant digits, or the atomic mass values used by different references or teachers.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.