How many grams is 2.393 x 10^24 atoms of O A. 70.45 g O
B. 140.9 g O
C. 63.58 mole O
D. 63.58 g O
Thanks for all the efforts :)

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?

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