amount of substance

• Moles is the unit used to measure amount of substance.
• Avogadro's constant represents the number of atoms per mole of the carbon-12 isotope.
• mass of one mole = relative atomic mass in grams
• moles (mol) = mass (g) / Mr (g mol-1)
• Avogadro's constant is 6.022 x 10^23.
• Avogadro's law states that under the same temperature and pressure, one mole of any gas would occupy the same volume.
• At room temp and pressure a gas would occupy 24dm3 or 24000cm3.
• molar gas volume = the volume per mole of gas molecules