Chemistry · Chapter 3

The Mole Bridge

Mass, moles and particle count are three views of one sample. Type a number into any box and the other two follow. Molar mass links grams to moles and Avogadro's number links moles to a count.

The bridge values update as you type

Mass, moles and particle count joined by two conversion factors MASS 18.02 grams MOLES 1.000 mol 3.00 mol of atoms in all PARTICLES 6.022 × 10²³ molecules divide by molar mass ÷ 18.02 g/mol multiply by molar mass × 18.02 g/mol multiply by 6.022 × 10²³ particles per mole divide by 6.022 × 10²³ particles per mole Start anywhere. Everything routes through moles. A pinch you could hold.

One mole of water is 18.02 g and holds 6.022 × 1023 molecules. Change any box to see the other two move.

How big is that count? log scale

Where this particle count sits on a scale of powers of ten

Each step along the line is ten times the one before it. A mole sits near the far right, past every count you meet in daily life.

Your sample

Substance
H₂O
molar mass 18.02 g/mol · 3 atoms per molecule
Type into any one box
g
mol
count

The work, written out

Units cancel down the page. If the leftover unit is not the one you wanted, the factor was flipped the wrong way.