How to Calculate Moles (n)
Universal mole conversion across state metrics:
Choose State Mode
Select Mass (solid), STP Gas Volume (gas), or Concentration (solution).
Input Data
Enter mass (g), gas volume (L), or molarity and solution volume.
Compute Moles (n)
System calculates exact mole quantity n in real-time.
View Equivalents
Get equivalent STP gas volume and total molecule count via Avogadro's constant.
Key Features & Universal Formulas
All-in-One Stoichiometry
Unifies solid mass, ideal gas, and solution concentration formulas into one calculator.
STP Molar Volume Constant
Uses IUPAC standard molar volume of ideal gas Vm = 22.414 L/mol at 0°C, 1 atm.
Avogadro Particle Tally
Computes total subatomic or molecular entities N = n × NA.
Stoichiometry Guide: The Universal Mole Relationship
In chemical stoichiometry, the mole connects all states of matter:n = m / M = Vgas / 22.414 = Msoln × Vsoln = N / NA
Frequently Asked Questions
?Why is molar gas volume equal to 22.4 Liters at STP?
By Avogadro's Law and the Ideal Gas Law PV = nRT, 1.0 mole of any ideal gas occupies 22.414 Liters at standard temperature (0°C / 273.15 K) and pressure (1 atm).