Concepts
What do you use to balance an equation?
Coefficients
Where does the mole ratio come from?
The coefficients in a balanced chemical equation
How do you convert from grams of A to moles of A?
Divide by the molar mass of A
What is the formula for percent yield?
(Actual Yield/Theoretical Yield) x 100
What is the reactant that runs out first?
The limiting reactant
Why do chemical equations need to be balanced?
Law of Conservation of Mass
C5H12 + 8O2 → 5CO2 + 6H2O
How many moles of carbon dioxide can I make from 16 moles of carbon dioxide?
10 moles of carbon dioxide
How do you convert from moles of A to moles of B? Mention what goes in the numerator and denominator.
Use the mole ratio- mol B/molA
The theoretical yield of a product happens only under ____________ conditions.
Perfect!
What reactant does not run out when a reaction is complete?
What is on the left side of the arrow in a chemical equation?
Reactants
Balance. ___Al + ___Fe3O4 ---> ___Al2O3 + ___Fe
8 Al + 3 Fe3O4 ---> 4 Al2O3 + 9 Fe
H2SO4 + 2 NaOH → Na2SO4 + 2 H2O
What mass of H2SO4 would be required to react with 0.75 mol of NaOH?
37 grams H2SO4
The amount of product that is actually produced
Actual Yield
In the reaction NaCl + AgNO3 → AgCl + NaNO3, Sodium chloride produces 12 grams of sodium nitrate and silver nitrate produces 15 grams of sodium nitrate. Which reactant is in excess?
Silver nitrate
What thing causes your reaction to stop?
Limiting Reactant
CH4 + 2 O2 --> CO2 + 2 H2O
If I want to get 5.3 moles of water, how many moles of methane (CH4) do I need?
2.7 moles of methane
2 Na + 2 H2O → 2 NaOH + H2
How many moles of H2 are produced in the reaction with 5.0 grams of water?
0.14 moles H2
In an experiment, you obtain 22 grams of sodium chloride product. The theoretical yield of this reaction is 25 grams of sodium chloride. What is the percent yield?
88%
In the reaction 2 H2 + O2 → 2 H2O, H2 produces 23 grams of water and O2 produces 13 grams of water.
Which one is the limiting reactant?
O2
The quantitative amounts of reactants and products in a chemical equation
Stoichiometry
2 Fe + 6 HC2H3O2 → 2 Fe(C2H3O2)3 + 3 H2
0.123 moles of hydrogen acetate react with how many moles of iron?
0.0410 moles of iron
Sn + 2 HF → SnF2 + H2
How many grams of SnF2 are produced from the reaction of 30.0 g of HF?
117g SnF2
Calculate the theoretical yield of FeS produced from the 0.27 grams of Fe in the reaction: Fe + S → FeS
0.43 g FeS
SnO2 + 2 H2 → Sn + 2 H2O
You have 36 g of SnO2 and 36 g of H2. Find the limiting reactant.
SnO2