Answer
Since the atoms cannot be created or destroyed, they will always react with each other in a whole number ratios to form molecules. When a molecule is created, it will be made of exact ratio of atoms, and will have a constant composition until it undergoes a new chemical reaction. Some atoms can form a molecule in a few different proportions of atoms used, but in each such instance shall be formed a new molecule with a different properties than the other ones. Since atoms cannot be created or destroyed, the mass of matter before and after reaction will remain the same.
Work Step by Step
Since the atoms cannot be created or destroyed, they will always react with each other in a whole number ratios to form molecules. When a molecule is created, it will be made of exact ratio of atoms, and will have a constant composition until it undergoes a new chemical reaction. Some atoms can form a molecule in a few different proportions of atoms used, but in each such instance shall be formed a new molecule with a different properties than the other ones. Since atoms cannot be created or destroyed, the mass of matter before and after reaction will remain the same.
