Identify the mass law that each observation demonstrates. a flashbulb contains magnesium and oxygen before use and magnesium oxide afterward, but its mass does not change.

answer; i believe the correct answer is (solid gold);

solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.