Law of Multiple Proportions
If elements A and B react to form two compounds,
the different masses of B that combine with a fixed
mass of A can be expressed as a ratio of small whole
numbers:
Example: Nitrogen Oxides I and II
Nitrogen Oxide I : 46.68% nitrogen and 53.32% oxygen
Nitrogen Oxide II : 30.45% nitrogen and 69.55% oxygen
Assume that you have 100 g of each compound.
In 100 g of each compound: g O = 53.32 g for oxide I and 69.55 g for oxide II
g N = 46.68 g for oxide I and 30.45 g for oxide II
= 2
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