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Answer :
Given, ratio of H : O by mass to form water = 1 : 8
\(\Rightarrow \) 1 g of hydrogen required 8 g of oxygen to react completely.
We have to find the mass of oxygen that is required to completely react with 3 g of hydrogen.
So, 3 g of hydrogen will require \( (8 × 3) \)g of oxygen
\(\therefore \) 24 g of oxygen is required to completely react with 3 g of hydrogen.