State the law of constant proportions. Give one example to illustrate this law.
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The law of constant proportion was given by Joseph Louis proust.
It says that in a chemical substance (compound) elements are always present in definite proportion by mass.
For example: In a compound such as water the ratio of mass of hydrogen to the mass of oxygen is always 1:8.
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. Hydrogen and oxygen combine together to form water molecules. They combine together in a ratio of 2 : 1 respectively. Water molecules are available in a set ratio of mass.
. As the water molecules have a fixed ratio, therefore they obey the law of constant proportions.
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