Question

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

Answer 1

mallest unit of matterStates of matterSolid, liquid, gasmatteroccupies space, has mass and volume

Answer 2

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