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.

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?

•

•

• 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)

• What is the concentration of a NaCl solution when I dissolve 34.5 grams of salt in 1.40 liters of solution?

• 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

• 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

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?

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?

• 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?

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

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)

• 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.