A.) top to bottom:
900, 1000, 1200
B.) top to bottom:
250, 450
I think the mass the mass was less than the original because a gas was released into the atmosphere. The mass in a chemical reaction is constant in a closed system according to conservation of mass law. However, if a chemical reaction is completed in an open system, mas changes may occur. In our case i think the change in mass was due to the release of hydrogen gas from the reaction to the atmosphere.
Answer:
stuff around the earth
Explanation:
like water,fire,wind,and earth/plants
