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What is the molecular weight of H₂and O₂ that is added to get one molecule of H₂O (water) with the molecular weight of 10?

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1 and 5

4 and 6

None

2 and 8

answer is A.

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Detailed Solution

Solution:

Concept: According to the law of conservation of mass the total mass of the products is equal to the total mass of the reactants.

To get one molecule of H₂O (water) with a molecular weight of 10, Hydrogen with a molecular weight of 2 is added with Oxygen whose molecular weight is 8, thereby conserving the mass.

Hence the molecular weight of H₂ added is 2 and that of oxygen is 8.

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