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Moles, Grams & Avogadro Stoichiometry Calculator

The mole is the SI base unit for chemical amount of substance, providing the essential bridge between microscopic molecules and macroscopic masses.

Molecular or atomic weight in g/mol (Water H₂O = 18.015, NaCl = 58.44, Glucose C₆H₁₂O₆ = 180.16).

Choose whether you are providing grams or moles.

Mass in grams or amount in moles.

Calculated Result
2.0000 mol

Molar Quantity

Amount in Moles

2.0000 mol

Mass in Grams

36.030 g

Total Particles

1.204e+24 molecules

Molar Mass

18.015 g/mol

STP Gas Volume

45.42 L

Calculation Breakdown

  1. Molar Mass Conversion FactorMolar Mass M = 18.015 g/moln=mM  ⟺  m=n×Mn = \frac{m}{M} \iff m = n \times M
  2. Amount of Substance in Moles2.0000 mol (36.030 g)nn
  3. Avogadro's Number Particle Count1.2044e+24 molecules / atomsN=n×NA,NA=6.02214×1023N = n \times N_A, \quad N_A = 6.02214 \times 10^{23}
  4. Equivalent Ideal Gas Volume at STP45.42 Liters (if gaseous at standard 0°C, 1 bar)V=n×22.71 L/molV = n \times 22.71 \text{ L/mol}

Molar Mass Comparison of Common Compounds (g/mol)

Interactive visualization based on your current inputs

Molar Mass (g/mol)
0.086171257342H₂O (Water)NaCl (Salt)C₆H₁₂O₆ (Glucose)C₁₂H₂₂O₁₁ (Sucrose)CompoundMolar Mass (g/mol)

What Is the Moles, Grams & Avogadro Stoichiometry Calculator?

The mole is the universal currency of chemistry, translating macroscopic benchtop masses measured on balances into exact counts of reacting molecules.

Mastering conversions between grams and moles is the foundational skill of chemical stoichiometry.

How Does the Moles, Grams & Avogadro Stoichiometry Calculator Work?

Molar mass gives the ratio of grams per mole: M = m/n.

Avogadro’s constant translates molar amount into discrete particles: N = n · N_A.

Moles, Grams & Avogadro Stoichiometry Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

n=mM,N=n×6.02214×1023n = \frac{m}{M}, \quad N = n \times 6.02214 \times 10^{23}

Dividing mass by molar mass yields chemical moles; multiplying moles by Avogadro’s number gives total individual molecules or formula units.

How to Use the Moles, Grams & Avogadro Stoichiometry Calculator

  1. Enter the molar mass of your compound in g/mol.
  2. Select whether your input is in grams or moles and enter the value.

Step-by-Step Example Calculation

Two Moles of Water (H₂O)

Input Values:

molarMass:18.015
givenType:mass_grams
givenValue:36.03
Worked Steps: 36.03 grams of water (M = 18.015 g/mol) equals 2.000 moles, containing 1.204 × 10²⁴ individual H₂O molecules and occupying 45.42 L as an ideal gas at STP.

Understanding Your Result

Moles (mol): Chemical reaction amount.

Mass (g): Physical weight on a balance.

Particle Count: Total molecules, formula units, or atoms.

Gas Volume (L): Volumetric footprint if existing as gas at STP.

Factors That Affect the Result

  • Purity: Impurities reduce the active molar fraction of a weighed sample.
  • Hydrates: Bound water of crystallization (e.g. CuSO₄·5H₂O) adds to the formula molar mass.

When Should You Use This Calculator?

  • Weighing reagents for chemical synthesis and reaction stoichiometry.
  • Determining limiting reagents and theoretical product yields.

Assumptions & Limitations

  • Assumes pure chemical substance without unaccounted hydration shells.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Standard SI stoichiometric conversion using exact 2019 SI redefinition constants.

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