Mole Concept Calculator

Convert between moles, molecules, mass, and gas volume

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Input Parameters

Choose Calculation Type:

Molecules ↔ Moles Conversion

  • For Molecules: Use scientific notation for large numbers (e.g., 1.5e23) [ 1.5e23 = 1.5 × 10²³]

    • Calculate:

    molecules
    mol

    Results

    Select calculation type and enter values to see results

    Important Constants

    Avogadro's Number

    6.022 × 10²³
    molecules/mol

    Molar Volume (STP)

    22.4
    L/mol

    Gas Constant (R)

    0.08206
    L·atm/(mol·K)

    Key Formulas

    n = N / Nₐ
    Molecules to Moles
    n = m / M
    Mass to Moles
    n = V / Vₘ
    Gas Volume to Moles (at STP/NTP)
    n = PV / RT
    Gas Volume to Moles (custom conditions)

    Usage Tips

    • For Molecules: Use scientific notation for large numbers (e.g., 1.5e23)
    • For Mass: Find molar mass from periodic table or molecular formula
    • For Gases: Choose STP for standard conditions or NTP for room temperature
    • Custom Conditions: Use ideal gas law for non-standard temperature and pressure