We have 250g of potassium oxide. Atomic masses of potassium and oxigen are, respectively, 39 and 16g/mol. how many atoms of potassium do we have? How many atoms of oxygen do we have ?

Magnesium is the limiting reactant in this experiment. calculate the theoretical yield of mgo for each trial. trial 1: trial 2: data mass of empty crucible with lid trial 1: 26.688 trial 2: 26.681 mass of mg metal, crucible, and lid trial 1: 26.994 trial: 2 26.985 mass of mgo, crucible, and lid trial 1: 27.188 trial 2: 27.180