According to the law of constant proportion , what will be the correct ratio of obtained oxygen and hydrogen ( O : H ) after decomposition of 18 g water ?
16 : 2
The correct answer is option 2 i.e. 16:2.
According to the Law of Constant Proportion, a chemical compound always contains the same elements in a fixed ratio by mass, regardless of the source or method of preparation.
Water (H₂O) always consists of:
-
Hydrogen (H): 2 atoms
-
Oxygen (O): 1 atom
Molar masses:
-
Hydrogen = 1 g/mol (for one atom, so 2 g/mol for H₂)
-
Oxygen = 16 g/mol
So, the mass ratio of oxygen to hydrogen in water is:
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