How many molecules are in 12.5g of water (H20)

Mallest unit of matterStates of matterSolid, liquid, gasmatter occupies space, has mass and volume

I think you convert grams to moles and then multiply the moles by Avogadro's number aka the number of atoms per mole.

So 12.5g x 1mole/18.016g =.69

.69 x (6.22 x 10^23) = 4.29 molecules