Avagadro -...

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Avagadro's Law : The volume of a gas is directly proportional to the number of  molecules in the gas. In this example there is twice the amount of H 2  gas and O 2  gas, as predicted by the  stoichiometry of the chemical equation. These integer relationships between gas volumes  were some of the earliest proof we had that matter existed in discrete packages called  atoms and molecules. Just as any good chef wants to add together the correct amount of each ingredient for  the best recipe so does the chemist also want to add together the correct number of  molecules called for by a chemical reaction to produce the desired product. For example,  to separate water molecules into H 2  and O 2  gas our Hoffmann apparatus had to put  electrical energy into the reaction. We could have written the chemical reaction for this  as 2 H 2 O (l)  + 571.6 kJ   2 H
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Avagadro -...

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