Question

3. Study the reaction given:
2H,O → 2H, + O2
The mass number of hydrogen is 1 and that of oxygen is 16. Verify if the reaction obeys the
law of conservation of mass.​

Answer 1

The option (A) is a suitable example for illustrating the law of conservation of mass. 

18g of water is formed by the combination of 16g oxygen with 2g of hydrogen.

Total mass of reactants =16+2=18 g.

The mass of products =18 g.

Since, the mass of products is equal to the total mass of reactants, the 

mass is conserved during the reaction.

Note: The option (A) represents chemical change and all other options represent physical change. The law of conservation of mass corresponds to a chemical change.

Answer 2

Answer:

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Explanation:

Reaction:

2H₂ + O₂ -----------> 2H₂O

According to this reaction,

2 moles of H₂ reacts with 1 moles of O₂ to give 2 moles of H₂O.

Hence,

Mass of Reactants: {2 x 2(1)} + 2(16) = 36g

Mass of Product: (2x2)+(2x16) = 36g

According to Law of conservation of mass this reaction is correct