If 9gm of water is decomposed how many grams of hydrogen and oxygen are obtained.
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In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always 1:8, whatever the source of water. Thus, if 9 g of water is decomposed, 1 g of hydrogen and 8 g of oxygen are always obtained.
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It indicates, that if 9g of water is decomposed, 1g of hydrogen and 8g of oxygen will be liberated. This led to the law of constant proportions which states that ' In a chemical substance, the elements are always present in definite proportions by mass '.
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