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÷ 6.02 × 1023
÷ molar mass
× 6.02 × 1023
× molar mass
Practice – calculate the molar mass
KCl – CO –
C3H8 – H2O –
Practice – convert the following
2.6 moles KCl to grams –
65 grams H2O to moles –
0.88 moles CO to molecules –
Practice – calculate percent mass
KCl – CO –
Skill – Finding Molecular Formula
1. Calculate the molar mass of the
2. the molar mass of the molecular by the molar mass of the empirical formula
Practice – empirical vs. molecular
Skill – Balancing Equations
(both sides have of each element)
1. Determine reactants and products (predict products using correct formula)
2. Assemble the parts of the reaction
- Start with elements that appear once on each side
- Never start with hydrogen or oxygen
- If you end up with a half (0.5, 1.5) multiply entire equation by 2
Concentration of reactants
2Na + Cl2
Mg + CuSO4
NaCl + AgNO3
C3H8 + O2
Practice – analogy questions
Ham and Cheese Sandwich:
1 Ham + 2 Bread 1 Sandwich
Ham + Bread 4 Sandwich
Ham + 4.6 Bread Sandwich
If you have 2 pieces of ham and 6 pieces of bread, how many sandwiches can you make?
What will you have leftover?
Practice – stoichiometry questions
H2 + Cl2 2 HCl
How many moles of H2 is required to react with 4 moles of Cl2?
How many moles of HCl will be produced from 2.3 moles of Cl2 and 3 moles of H2?
What is the excess reagent?
Skill – Calculating Percent Yield
If you are supposed to produce 60 grams of H2O, but only produce 16 grams, what is your percent yield?
Skill - Solubility Rules
All Group 1A (alkali metals) are soluble
All ammonium salts (NH4+) are soluble
All nitrates (NO3-), chlorate (ClO3-), perchlorate (ClO4-), and acetate (C2H3O2-) are soluble
All chloride (Cl-), bromide (Br-), and iodide (I-) salts are soluble except Ag+, Pb2+, Hg2+
All Sulfate (SO42-) compounds are soluble except Ba2+, Sr2+, Ca2+, Pb2+, Hg2+
All hydroxide (OH-) compounds are insoluble except those of Group 1A and Ba2+, Ca2+, and Sr2+
All sulfide (S2-) compounds are insoluble except Groups 1A and 2A
All sulfites (SO32-), carbonates (CO32-), chromates (CrO42-), and phosphates (PO43-) are insoluble except NH4+ and Group 1A
Skill – Calculating Molarity
Practice – calculate the molarity
What is the molarity of a 4 Liter solution containing 3 moles of solute?
How many moles of solute are in 800 mL of a 1.5 M solution?
Skill – Writing Complete/Net Ionic Eq.
Identify all aqueous compounds in the equation
Rewrite the equation with all aqueous compounds written separately as their ions (with charges)