Question

Question #d1a01

Answer 1

`6.68*10^22` molecules of water `(H_2O)`

Explanation:

The number of molecules can be calculated by moles.

`"Moles"="Mass of substance"/"Molar mass of substance"`

`:. "Moles"_(H_2O)="2g"/(18.015"g/mol")=0.11101859561477`

`1` mole = `6.02*10^23` atoms, molecules, protons, etc. (Avogadro's constant)

`:. \ "Molecules of" \ H_2O=6.02*10^23 * 0.11101859561477 ~~ 6.68*10^22`