1. How many iron atoms present in 5.0 mol of iron metal?

2. Calculate the number of moles of sulfur represented by 1.81 X 10^24 atoms of sulfur?

3. How many grams are contained in 2.00 mol of Neon?

4. Calculate the number of moles of 20.0 g He

5. Calculate the number of atom in 15.0 g of Silver.

6. Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas:

                              Si + 2Cl₂ → SiCl₄

In reaction. 0.507 mole of SiCl₄ is produced. How many moles of molecular chlorine were used in the reaction?

7. 4KO₂ + 2H₂O  →  4KOH + 3O₂

 If 0.25 mol KO₂ added to 0.15 mol H₂O. How many moles of oxygen can be produced?

What is limiting reactant?

8. Calculate the formula weight of CHCl₃.

9. Magnesium metal burns in oxygen to form magnesium oxide, MgO

a. Write a balanced equation for the reaction.

b. How many grams of oxygen are needed to react with 25.0 g. of Mg?         

10. Calculate percent of Hydrogen in ammonium nitrate NH₄NO₃.