If 100 grams of pure water taken from different sources is decomposed by passing electricity, 11 grams of hydrogen and 89 grams of oxygen are always obtained.' Which chemical law is illustrated by this statement?

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Solution

Law of Definite Proportions is illustrated by the above statement. According to the law of definite composition, all the sample of any chemical compound has the same composition of elements by mass.

Water is a compound which always consists of the same two elements hydrogen and oxygen combine together in the same constant proportion of 1:8 by mass (1 part by mass of hydrogen and 8 parts by mass of oxygen). Hence water is taken from anywhere will have the chemical composition of 8:1 of oxygen and hydrogen respectively by mass.

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A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced a the positive electrode whereas gas Z is obtained at the negative electrode. Moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.
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