Lavoisier, along with other scientists, noted that many compounds were composed of two or more elements and each such compound had the same element have same proportions, irrespective of where the compound came from or who prepared it.
In a compound such as water, the ratio of the mass of hydrogento the mass of oxygen is always 1:8, whatever the source of water. Thus, it99 of water is decomposed, 1g of hydrogen and 8 g of oxygen are alwaysobtained. Similar in ammonia, nitrogen and hydrogen are always presentin the ratio 14:3 by mass, whatever the method or the source from whichit Is obtained.
1lWrite the mass ratio of elements hydrogen and oxygen present in water.
2)Name the law of chemical combination explained in the given paragraph.
3)Define the law.
4) Write the mass of nitrogen and hydrogen obtained when 349 of ammonia is decomposed?
5)What mass of oxygen gas would be required to react completely with 3g of hydrogen gas to form water?
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1) 1:8
The ratio of hydrogen and oxygen by mass in water is 1:8. The atomic masses of H and O are 1 g/mol and 16 g/mol respectively. In H2O, the ratio of hydrogen and oxygen by mass will be 2:16=1:8.
2)The law of definite proportions, .
3)The law of definite proportions, also known as the law of constant proportions, states that the individual elements that constitute a chemical compound are always present in a fixed ratio (in terms of their mass). This ratio does not depend on the source of the chemical compound or the method through which it was prepared.
Explanation:
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