The mass that is easily forgotten about when trying to prove the law of conservation of mass in a chemical reaction is rock. The correct option is 4.
What is conservation of mass?
The conservation of mass states that mass is neither created nor destroyed in chemical reactions, which led to the formulation of the Law of Conservation of Mass. It was given by Antoine Lavoisier and discovered in 1789.
That is to say, the mass of any one element at the start of a reaction will be equal to that element's mass at the conclusion of the reaction. The mass is never totally conserved, which disapproves of the law. But mass plus energy is always conserved.
The mass of rock can be easily forgotten because of the law of conservation of mass is taken on the basis of gas molecules.
Thus, the correct option is 4. rock.
To learn more about the conservation of mass, refer to the below link:
https://brainly.com/question/13383562
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