A recipe for a cake calls for both liquid and dry ingredients. If you are following the recipe, how will the order in which you add the ingredients affect the mass of the batter?
It will have no effect because the order in which ingredients are mixed will not change the fact that matter cannot be created nor destroyed.
If you add the dry ingredients first, the final result will have less mass than if you added the liquid ingredients first. This is because the dry ingredients will be dissolved by the liquid ingredients.
It will have no effect because the order in which ingredients are mixed will not change the fact that the mass of the batter will be greater than the masses of the ingredients.