A sample of pure water irrespective of its source contains 88-88% oxygen and 11-12% hydrogen by mass. The data supports

1. Law of Conservation of Mass

2. Law of Constant Proportions

3. Dalton's Atomic Theory

4. Avogadro's law.

The correct option is B

Law of Constant Proportions

• According to the law of conservation, mass can neither be created nor be destroyed, it remains the same throughout the reaction.
• The Law of constant proportions is supported because the law of constant proportion states that chemical compounds are made up of particles that are present in a fixed ratio by mass.
• Dalton's atomic theory tells us about the structure of an atom.
• According to Avogadro's law, a statement that under the same conditions of temperature and pressure, an equal volume of different gases contains an equal number of molecules.
• Hence the correct option is (b)-the law of constant proportions