Formula, Mole, and Density
- A formula that simply gives the ratio of the number of atoms of each element in a compound.
- Example: The empirical formula of hydrogen peroxide, H2O2, is HO.
- A formula that gives the actual numbers of atoms of each element in each molecule of a compound.
- Example: The molecular formula of hydrogen peroxide is H2O2.
- A mole is a measure of the number of atoms, molecules, or ions there are present. One mole of particles is 6.02 x 1023 particles (Avogadro's number).
Number of moles = mass in grams / molecular weight
- Density = mass / volume