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Question

# Carbon is ground to form two oxides which contains 42.9 % and 27.3% carbon respectively.Show that this figure illustrate the law of multiple proportions.

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Solution

## It states that the masses of one element which combine with fixed mass of second element are in a ration of whole number therefore the masses of oxygen in the two compounds that combine with fixed mass of carbon should be in a whole number ration 100 gram of first compound contains 42.9% of carbon and 57.1% oxygen. so 42.9 gram of carbon and 57.1 gram of oxygen the mass of oxygen per gram of carbon is 57.142.9=1.33gram O per gram c the 100 gram of second compound there are 72.7 gram of O and 27.3 gram of C the mass of oxygen per gram of carbon is 72.727.3=2.66 gram O per gram C The mass fraction =2.661.33=2:1 the whole number ratio is consistent with the law of multiple.

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