Chapter 9 the mole

What is a mole

An amount of a substance that contains 6X10^23 particles of that substance

Particles

Atoms/ions/molecules/subatomic particles

Molar mass

The mass of one mole of a substance expressed in grams

Molar volume

Is the amount of space that one mole of a gas takes up

NB. Molar volume depends on temperature

STP: 22.4 litres/ 22,400cm3

RTP: 24 litres/ 24,000cm3

Elements composed of two atoms

H2, N2, F2, O2,I2,CL2, Br2

Hydrogen, nitrogen, fluorine, oxygen, iodine, chlorine, bromine

Have No Fear Of Ice Cold Beer

If you are asked for atoms / ions of something that exists as a molecule

You must convert to molecules first and then to atoms / ions

The number of atoms/ions in a compound will always be greater than the number of molecules

Mol → molecules → atoms