Avogadro's Principle states that equal volumes of gases at equal temperature and pressure, will contain the same number of particles. Therefore now we can have a molar volume, just as we have a molar mass.
The molar volume of any gas at STP is 22.4 L. This can be determined by using the ideal gas law.
REMEMBER! This only applies to a GAS at STP.
We can now apply this concept to chemical reactions. If a reaction takes place at constant temperature and pressure, the ratio of all the gases (reactants and products) will be the same as the mole ratio.
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