Grams to Moles Calculator
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Grams to Moles Calculator

Result:

How to Use This Calculator

This grams to moles calculator makes it easy to convert between mass and moles of a substance:

  1. Enter the mass of your substance in grams in the first input field
  2. Either enter the molar mass of your substance in g/mol, or select a common compound from the dropdown menu
  3. Click "Calculate Moles" to see the result

The calculator will display the amount of substance in moles based on your inputs.

What This Calculator Is Used For

The grams to moles calculator is an essential tool for chemistry students and professionals. It helps with:

  • Converting between mass and moles in chemical calculations
  • Preparing solutions with specific molar concentrations
  • Balancing chemical equations
  • Determining stoichiometric ratios in reactions
  • Calculating theoretical yields in chemical synthesis

The Formula

The calculator uses the basic formula that relates mass, moles, and molar mass:

n = m / M

Where:

  • n = amount of substance in moles
  • m = mass of the substance in grams
  • M = molar mass of the substance in grams per mole (g/mol)

Example Calculation

Let's calculate how many moles are in 25 grams of water (H₂O):

Given:

Mass of water = 25 g

Molar mass of water = 18.015 g/mol (from periodic table: 2×H + 1×O = 2×1.008 + 15.999)

Calculation:

n = m / M

n = 25 g / 18.015 g/mol

n ≈ 1.3877 mol

Result:

25 grams of water is approximately 1.39 moles.

You can verify this by entering 25 in the mass field and selecting "Water (H₂O)" from the dropdown menu in the calculator above.