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in Some Basic Concepts of Chemistry by (30.3k points)
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Nitrogen forms various oxides. 

1. Identify the law of chemical combination illustrated here. Also state the law. 

2. Determine the formula of each oxide from the given data and illustrate the law.

 Oxides  Mass of N  Mass of O  Formula
 Oxide I   14   16  ......
 Oxide II   14   32  ......
 Oxide III   28   16  ......
 Oxide IV   28   48  ......

1 Answer

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1. Law of multiple proportions. 

When two elements combine to form more than one compound the different mass of one of the elements which combine with the fixed mass of the other element bear a simple ratio.

2. 

 Oxides  Mass of N  Mass of O  Ratio  Formula
 Oxide I   14   16  1:1  NO
 Oxide II   14   32  1:2  NO2
 Oxide III   28   16  2:1  N2O
 Oxide IV   28   48  2:3  N2O3

In NO and NO2 , the masses of oxygen combining with a fixed mass (14 g) of nitrogen are in the ratio, 16:32 = 1:2. Similarly, in N2O and N2O3 , the masses of oxygen combining with a fixed mass (28 g) of nitrogen are in the ratio, 16:48 = 1:3. These are simple whole number ratios. Hence, the law of multiple proportions is verified.

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