1.  *Questa è una scheda preparata. Utilizza il link nella parte superiore della pagina per ottenere una pagina stampabile. 
 2.  For every two million pounds of fertilizer manufactured at Bigearth, Inc., about420pounds are ruined by being accidentally left out in the rain. Last month,300pounds were ruined. Based on this information, estimate how many pounds of fertilizer were manufactured last month. Round your answer to the nearest whole number if needed.


3.  Hailey worked overtime at the lab to perform a chemical analysis on some sludge of unknown composition. She found it to be26.1% water by mass. If she completely dried a141g (original mass) of the sludge, how much water was removed in the drying process? Round your answer to the nearest hundredth.

 4.  The ratio of iron atoms to chromium atoms in a water sample from the treatment pond at ZGlobe is11to7. If there are183chromium atoms in a liter of the water, how many iron atoms are there in a liter? Round your answer to the nearest whole number if needed.


5.  A sample of steel made at the Bigtown Steel Works, was analyzed and found to contain0.12% carbon (by mass). How many kilograms of this kind of steel could be made from0.6kg of carbon? Round your answer to the nearest hundredth if needed.

 6.  In a mixture of CaCO3 and C_{un}SO_{4}the ratio of C_{un}CO_{3}to C_{un}SO_{4}molecules is7to2. If there are10billion molecules of C_{un}SO_{4}, how many total molecules are in the mixture?

