This is a rule, not a hypothesis. The fact that matter cannot be generated or destroyed through any chemical change would be an established law according to previous experiments. It was a notion that was put to the test before becoming a law.
The law of conservation of energy, which states that energy cannot be generated or destroyed but may only be changed from one form to another, is the most fundamental law of thermodynamics.
According to the Law of Conservation of Mass, the matter might change forms, mixtures could be created or separated, and pure substances could be broken down, but the overall mass does not change. It claims that neither chemical processes nor physical changes can create nor remove mass from an isolated system.
Therefore, given statement is a law.
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