Question
The percentage of Fe and O2 in samples of Fe2O3 obtained by different methods were found to be the same.” This statement is proved by which of the following laws?
- Law of constant proportion
- Law of definite proportion
- Law of conservation of mass
- Law of multiple proportion
Hint:
Irrespective of the method used to find the percentage, the ratio by mass always remains the same.
The correct answer is: Law of constant proportion
- The Law of constant proportion explains the statement "the percentage of Fe and O2 in samples of Fe2O3 obtained by different methods were found to be the same.”
- The Law of constant proportion states that chemical compounds are made of elements that are known to be present in a fixed ratio by mass. It suggests that all pure samples will consist of the same elements that are present in the same ratio by mass.
- The percentage of Fe and O2 in Fe2O3 is the same even when found by different methods because all pure samples have the same ratio by mass.
The Law of constant proportion is also known as the Law of definite proportion or Proust's law.
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