500
Angie mixes the fertilizer for her plants at the beginning of the week. She puts 40 g of the fertilizer-water solution in each of the seven closed containers and uses one container each day to water her plant. One day, she goes outside to get a container and finds that the solution in it is frozen. How much mass should the frozen solution in the container have? What law does this follow?
What is 40 g? Law of Conservation of Mass?