two atoms each. Thus two molecules of hydrogen can combine with one molecule of oxygen to produce two molecules of water. Avogadro suggested that equal volumes of all gases at the same temperature and pressure contain the same number of molecules. It was long after Avogadro died that the idea of a mole was introduced. Since a molecular weight in grams (mole) of any substance contains the same number of molecules, then according to Avogadro's Principle, the molar volumes of all gases should be the same. The number of molecules in one mole is now called Avogadro's number. Avogadro had no knowledge of moles or of the number that concord with his name. The number was never determined by Avogadro himself. Avogadro's number is very large, and the presently accepted value is 6.0221367 x 1023.
two atoms each. Thus two molecules of hydrogen can combine with one molecule of oxygen to produce two molecules of water. Avogadro suggested that equal volumes of all gases at the same temperature and pressure contain the same number of molecules. It was long after Avogadro died that the idea of a mole was introduced. Since a molecular weight in grams (mole) of any substance contains the same number of molecules, then according to Avogadro's Principle, the molar volumes of all gases should be the same. The number of molecules in one mole is now called Avogadro's number. Avogadro had no knowledge of moles or of the number that concord with his name. The number was never determined by Avogadro himself. Avogadro's number is very large, and the presently accepted value is 6.0221367 x 1023.