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The coefficients in a chemical equation represent:
- The relative number of particles(atoms, molecules, formula units)
- The relative number of moles(very similar to the relative number of particle)
- The relative volume of gases at constant temperature and pressure
Molar Volume- A volume of 22.4 dm3 - the volume of 1 mole of a gas at STP
Avogadro's Hypothesis- Equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules.