Chemistry                                                                                 Mrs. Addabbo

Stoichiometry

Name _________________________________________    Section ______

You may use the periodic table in your agenda. Remember to round atomic masses to the nearest tenth place. Do your work on a separate sheet of paper to hand in.

Mole Review Problems

1. Calculate the number of moles in each of the following quantities.

 a) 2.50 g KNO₃

 b) 10.8 g Ca(NO₃)₂

       c) 46.7 g H₂SO₄

 d) .035 g CuO

       2. Calculate the number of grams in each of the following quantities:

            a) 2.55 mol water

            b) 0.00844 mol oxygen gas

            c) 10.5 mol carbon dioxide

            d) 6.02 x 10²³  molecules of sodium hydroxide

Naming Compounds Review

3.      Name the compounds in question 1.

Stoichiometry

     4. For the reaction

3 CaCl₂ + 2 H₃PO₄ à Ca₃(PO₄)₂ + 6HCl

             Set up the mole ratios of:

a)      CaCl₂  to  Ca₃(PO₄)₂

b)      HCl to H₃PO₄

c)      CaCl₂  to H₃PO₄

d)      Ca₃(PO₄)₂ to H₃PO₄

e)      HCl to Ca₃(PO₄)₂

f)        H₃PO₄  to HCl

       5. For the reaction: 4 HCl + O₂ à 2 Cl₂ + 2 H₂O ,calculate the:

a)      number of moles of Cl₂ produced when 5.60 mol of HCl is reacted with oxygen

b)      number of moles of water produced when  4.5 mol of O₂ is reacted with HCl

c)      number of moles of oxygen needed to completely react with 40 moles of HCl

d)      number of grams of oxygen needed to produce 2 moles of chlorine

e)      number of grams of water produced when 4 moles of HCl is reacted with oxygen

f)        number of grams of chlorine produced when 64.0 g of oxygen is reacted with HCl