We tested our new found stoichiometry skills by figuring out how many molecules we would consume if we drank from the school water fountain for 30 seconds.

I had my students make predictions before we started. Their predictions turned out to be waaaaaaaaaaaaaaaaayyyyyyyy off. Let’s just say the highest prediction was 1,000,000 molecules of water.

Each group collected 30 seconds of water from the water fountain. We measured the mass of water in each pitcher and averaged the results.

It turns out the size of a molecule is super tiny and super hard to wrap our minds around!

## Free Download of How Many Molecules? Lab

How Many Molecules? Lab (PDF) (163 downloads)

How Many Molecules? Lab (Editable Publisher File ZIP) (155 downloads)