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carbon is found to form two oxides which contain 42.9% and 27.3% carbon respectively.show that these figures illustrate law of multiple proportion.



The Law of Multiple Proportions is the third postulate of Dalton's atomic theory. It states that the masses of one element which combine with a fixed mass of the second element are in a ratio of whole numbers.

Therefore, the masses of oxygen in the two compounds that combine with a fixed mass of carbon should be in a whole-number ratio. In 100 g of the first compound (100 is chosen to make calculations easier) there are
57.1 g O and 42.9 g C.
The mass of O per gram C is: 57.1 g O / 42.9 g C = 1.33 g O per g CIn

the 100 g of the second compound, there are 72.7 g O and 27.3 g C. The mass of oxygen per gram of carbon is:72.7 g O / 27.3 g C = 2.66 g O per g C

Dividing the mass O per g C of the second (larger value) compound:
2.66 / 1.33 = 2

Which mean that the masses of oxygen that combine with carbon are in a 2:1 ratio.

The whole-number ratio is consistent with the Law of Multiple 
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