Question

Carbon dioxide in air and the carbon dioxide dissolved in water, both contain carbon and oxygen in ratio of 12:32 gram. This shows:

a. Law of conservation of mass
b. Law of constant proportion
c. Law of combination
d. Law of conservation of energy​

Answer 1

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b. Law of constant proportion

Answer 2

This shows Law of constant proportion.

• According, to the law of constant proportion, a chemical compound which is made out of some specific chemical elements will contain the constant amount of mass of it's constituent elements, regardless the source of the chemical compound.
• So, the mass ratio of the chemical compound's constituent elements is always constant.
• And, the circumstances mentioned in the question is a practical fulfilment of the law of constant proportion.