If by the law of conservation you mean the Law of Conservation of Matter, then it states that matter cant be created or destroyed.

If by the law of conservation you mean the Law of Conservation of Matter, then it states that matter cant be created or destroyed.

The conservation of Energy-Matter.

The law of conservation of mass/matter states that mass/matter cannot be created or destroyed in chemical or physical changes.

The law of conservation of matter is applied to processes not to a compound.