Gram to Gram
How many grams of water are produced when 16.0 g of methane (CH₄) burns completely in oxygen?
(CH₄ + 2O₂ → CO₂ + 2H₂O)
35.9 g H₂O
Which reactant is limiting if 5.0 g of H₂ reacts with 20.0 g of O₂ to form water?
(2H₂ + O₂ → 2H₂O)
Limiting reactant: O₂
Balance:
__H₂ + __O₂ → __H₂O
2H₂ + O₂ → 2H₂O
What type of reaction is this?
Na + Cl₂ → NaCl
Synthesis
Which element has the highest electronegativity?
Fluorine
If 10.0 g of hydrogen gas reacts with excess nitrogen, how many grams of ammonia (NH₃) are produced?
(N₂ + 3H₂ → 2NH₃)
56.3 g NH₃
What is the limiting reactant when 10.0 g of aluminum reacts with 20.0 g of chlorine gas?
(2Al + 3Cl₂ → 2AlCl₃)
Limiting reactant: Cl₂
Balance:
__Na + __Cl₂ → __NaCl
2Na + Cl₂ → 2NaCl
Determine the reaction type for the following:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Combustion
In terms of atomic radius, which is larger Mg or Ba?
Ba
How many grams of CO₂ are formed from the combustion of 25.0 g of ethanol (C₂H₅OH)?
(C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O)
47.8 g CO₂
Determine the limiting reactant and the amount of product formed when 15.0 g of NH₃ reacts with 20.0 g of O₂.
(4NH₃ + 3O₂ → 2N₂ + 6H₂O)
Limiting: O₂
11.7 g N₂
Balance:
__Al + __O₂ → __Al₂O₃
4Al + 3O₂ → 2Al₂O₃
What type of reaction is this?
CaCO₃ → CaO + CO₂
Decomposition
What is the molarity of a solution made by dissolving 10.0 g of NaCl in 500.0 mL of solution?
0.171 mol / 0.500 L = 0.342 M
How many grams of iron(III) oxide are produced when 32.0 g of iron reacts with oxygen?
(4Fe + 3O₂ → 2Fe₂O₃)
45.7 g Fe₂O₃
How many grams of sodium chloride are produced when 12.0 g of sodium reacts with 10.0 g of chlorine gas? Identify the limiting reactant.
(2Na + Cl₂ → 2NaCl)
Limiting: Cl₂
16.5 g NaCl
Balance:
__C₃H₈ + __O₂ → __CO₂ + __H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Identify the reaction type:
Zn + CuSO₄ → ZnSO₄ + Cu
Single Replacement
Base
Calculate the mass of aluminum sulfate formed when 45.0 g of aluminum reacts with sulfuric acid.
(2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂)
285.0 g Al₂(SO₄)₃
Given 25.0 g of C₃H₈ and 100.0 g of O₂, what is the limiting reactant and how many grams of CO₂ are produced?
(C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)
Limiting: C₃H₈
74.9 g CO₂
Balance:
__Fe₂O₃ + __C → __Fe + __CO₂
2Fe₂O₃ + 3C → 4Fe + 3CO₂
Classify this reaction:
HCl + NaOH → NaCl + H₂O
(Hint: Not one of the 5 on your notes, we just learned this...)
Acid–Base (Neutralization)
What is the molecular geometry of CH4?
Tetrahedral