1. MRS. PLATT HAD TO GO GET A NEW CANISTER OF PROPANE. WHEN SHE GOT BACK, IT WAS USED TO FIRE UP THE GRILL DURING A BACKYARD BARBEQUE. WHAT IS THE REACTION THAT TOOK PLACE? Write the word and balanced chemical equation with species.

2. Carbon amu 12.01g Hydrogen amu 1.01g Oxygen amu 15.999 g What kind of reaction is this? If I start with 12.4 g of propane what should my theoretical yield of water be? I obtained 3.21 g of water from this reaction, what is my percent yield?

3. If I started with 67.9 g of oxygen and obtained a percent yield for carbon dioxide of 72.4%, how many grams of carbon dioxide did I produce?

4. If I started with 45.6 g of oxygen and obtained a percent yield for water of 45.6%, how many grams of water did I produce?

5. MOLARITY

6. What is Molarity? Molarity Number of mols of solute dissolved in 1 liter of solution The # of mols per liter Expressed as M Why do we use it? Tells us the concentration of solutions 12 M HCl Means for every 1 liter of solution we have 12 mols of HCl Difference between concentrated and dilute Concentrated A lot of solute in solution (a lot of mols) Dilute Not a lot of solute in solution (not a lot of mols)

7. Practice Problem #1 What is the concentration of a NaCl solution when I dissolve 34.5 grams of salt in 1.40 liters of solution?

8. Practice Problem #2 What is the molarity of the solution when I dissolve 43.6 grams of KCl to create 45.6 mL of solution? 12.8 M KCl

9. You Try What is the molarity of the solution when I dissolve 12.3 grams of NaOH in water to creat 100 mL of solution? 3.08 M NaOH Hank the Mole dissolved 300.0 grams of HCl solid in water to create 3521 milliliters of soluton. What is the concentration of the solution Hank the Mole made? 2.334 M HCl

10. Sodium Hydroxide + Aluminum Sulfate What is my molarity if I dissolve 21.2 grams of sodium hydroxide in 450.0 mL of water? How many grams of sodium hydroxide are needed to make 255.0 mL of a 1.500 M solution? How many mL of solution are needed to dissolve 77.7 grams of sodium sulfate to make a 2.500 M solution? How many grams of aluminum hydroxide would I get from reacting 100.0 mL of a 1.250 M solution of sodium hydroxide with excess aluminum sulfate?

11. Iron (II) nitrate + Potassium Carbonate What is my molarity if I dissolve 78.25 grams of iron (II) nitrate in 890.1 mL of water? How many grams of potassium carbonate are needed to make 123.34 mL of a 0.500 M solution? How many cm 3 are needed to dissolve 12.2 g of potassium nitrate to make a 1.250 M solution? How many grams of iron (II) carbonate would I get from reacting 250.0 mL of a 3.210 M solution of potassium carbonate with excess iron (II) nitrate?

12. The following equation is NOT balanced: Na 2 CO 3 + HNO 3  NaNO 3 + CO 2 + H 2 O If 1.38 grams of sodium carbonate reacts and 15.00 mL of nitric acid are used, what is the molarity of the nitric acid?

13. We take solid sodium carbonate and dissolve it in distilled water. After it is dissolved we add sulfuric acid to the solution. Write the balanced chemical equation for the following...(include species) Determine the type of matter: heterogeneous/homogenous substance/mixture Element/compound/solution/colloid/course mixture Ionic/molecular Calculate all molar masses using the following: Sodium: 22.99g/mol Sulfur: 32.07g/mol Carbon: 12.01g/mol Oxygen: 16.00 g/mol Hydrogen: 1.0079 g/mol

14. Using your reaction answer the following questions. 1. If we react 34.2 g sodium carbonate, how many grams of sodium sulfate are formed? 2. If we have 97.2 g sodium carbonate in 750 mL of solution, what is the molarity? 3. If we have a molarity of 4.5 M and we only have 49.2 g sodium carbonate, how many mL of solution can we make? 4. If we need to make 100.0 mL solution of a 6.0 M sulfuric acid, how many grams do we need? 5. If we have 37.4 g sodium carbonate react completely with 155 mL of sulfuric acid, what is the molarity of the sulfuric acid? 6. If you have 34.7 g of sodium carbonate how many L of carbon dioxide gas will be produced? (1 mol of gas @STP= 22.4 L)

15. With your lab partner… Create a reaction… only supplying the reactants. Create a quiz for another group to take regarding that reaction. (After you determine your reaction, get approval) You need 5 questions: 1. mass-mass stoichiometry problem 2. Finding the concentration problem 3. Finding the mL with molarity and grams given. 4. Finding the grams with molarity and mL given. 5. Finding the molarity of a product with a given mass of a reactant. You will need to create a blank copy and a key.