● THE INTERACTIVE LAB / 03
Moles Calculator.
Explore mass, moles and particles in a visual chemistry lab with step-by-step calculations and guided challenges.
MEET THE MOLE
Same count. Different mass.
Keep the amount fixed and change the substance. What stays the same?
A model of amount, not the substance’s real appearance or volume.
A LOOK AT THE INVISIBLE
A mole is a count.
Like a dozen, but a much bigger number.
water molecules
Each full tile represents 0.1 mol, not one particle. Part-filled tiles represent fractions.
specified particles, exactly.
TRY A SMALL DISCOVERY
What happens if…
Try half a mole of water, then half a mole of carbon dioxide. The particle count is the same.
MAKE THE CONNECTION
A calculation you can follow.
Choose what you know. We will make the working visible.
THE REASONING
Ready when you are.
Enter your values to see the units, formula and substitution.
YOUR DISCOVERY TRAIL
Small challenges. Big understanding.
No timer. No lost points. A hint whenever you need one.
What to know about this model
A mole is an amount of substance. One mole contains exactly 6.02214076 × 10²³ specified entities. Those entities may be atoms, molecules or formula units. Always say what you are counting.
The explore view uses stated school-rounded molar masses. Molar mass M has units g mol⁻¹. Relative atomic, molecular and formula masses are dimensionless; their usual school values are numerically the same as M in g mol⁻¹.
The balance and tiles illustrate relationships, not actual particle sizes, arrangement, density or volume. Ionic formula units represent composition in a lattice, not separate molecules. Counting the constituent atoms in a formula does not mean those atoms are free particles.
Gas calculations use the selected approximate molar volume. The 24 dm³ mol⁻¹ setting is a common room-temperature-and-pressure approximation (around 20 °C and 1 atm). Use the conditions and values given in your question. Solution volumes refer to the whole solution.
Challenge checks accept answers within 0.5% to allow rounding. They are practice checks, not an exam mark scheme. Calculations retain precision internally and show up to four significant figures.
The SI definition of the mole, BIPM · Read the mole guide · Try equation balancing