Chapter 9 Study Guide
 Calculations From Chemical Equations

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1. Define each of the following:
        a) stoichiometry
        b) theoretical yield
        c) percent yield
        d) limiting reactant
        e) excess reactant
        f) balanced equation
        g) Avogadro’s hypothesis

2. What is conserved in a chemical reaction?

3. In a sealed glass vessel, a mixture containing sodium and chlorine reacts to form sodium chloride. The system contains only chlorine and sodium chloride after the reaction. What is the limiting reactant in this system?

4. Describe a burning piece of paper in terms of limiting reactant and reactant in excess.

5. In a limiting reactant problem, how does the total mass of the substances produced compare to the total mass of the substances consumed?

6. What is the ratio of the number of atoms in 1 mole of CCl₄ (s) to the number of atoms in 1 mole of SO₂ (g)?

7. What is the ratio of the number of molecules in 1 mole of CCl₄ (s) to the number of molecules in 1 mole of SO₂ (g)?

8. When 3.0 moles of hydrogen react completely with 1.5 moles of oxygen to form water, how does the mass of the system change?

9. What can one mole of a substance equal?

10. Find the molar mass of each of the following:
        a) Zn   
        b) F₂
        c) Li₂S
        d) NH₄NO₂
        e) Sn(SO₄)₂

11. In the reaction, 2CO (g) + O₂ (g) ˙ 2CO₂ (g), how many dm³ of CO are needed to produce 38.9 dm³ of CO₂?

12. In the reaction, 2Na (s) + 2H₂O (l) ˙ 2NaOH (aq) + H₂ (g) , how many moles of H₂ can be produced with 0.721 moles of Na?

13. In the reaction, FeS (s) + 2HCl (aq) ˙ H₂S (g) + FeCl₂ (aq) , what volume of H₂S will be produced when 237 grams of FeCl₂ are produced?

14. In the reaction, CH₄ (g) + 2O₂ (g) ˙ CO₂ (g) + 2H₂O (g) , how many moles of CO₂ are produced when 7.9 dm³ of O₂ react?

15. In the reaction, FeS (s) + 2HCl (aq) ˙ H₂S (g) + FeCl₂ (aq) , what mass of FeS is required to produce 58.9 grams of H₂S are produced?

16. Sodium reacts with silver chloride according to the equation below. 48.9 grams of sodium react with 280 grams of AgCl.
                                Na (s) + AgCl (aq) ˙ NaCl (aq) + Ag (s)

        a) What is the limiting reactant?

        b) What is the reactant in excess?

        c) How much excess is there?

        d) How much NaCl will be produced?