Which of the following contains the largest number of atoms? a. 82 g Kr
b. 0.842 mol C2H4
c. 36 g N2

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

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

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy