Chemistry · Chapter 3

Who Owns the Mass

A compound's recipe is fixed, so each element owns a fixed share of its mass. Pick a formula to split the ring, then set a sample size to turn those shares into grams.

Mass shares click a slice in the list

Percent composition of the chosen compound

How this element compares same element, other compounds

One element's mass percent across several compounds

Choose a compound

Your sample

25.0g of sample
0.1 g200.0 g

Percent as a decimal, times the sample mass, gives the grams of that element. The shares add to 100%, so the gram columns add back to the sample mass.