How many grams of ethylene glycol (c2h6o2) must be added to 1.15 kg of water to produce a solution that freezes at -4.46â°c?

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

Which best explains why an iceberg floats?

Ineed ! i have no clue how to do this problem.