The Mole Concept
How many particles are in one mole of a substance?
6.022 × 10²³ particles (Avogadro's number).
What is the mole ratio of H2 to O2?
2H₂ + O₂ → 2H₂O,
2 mol H2 : 1 mol O2
What is the law of conservation of mass?
Matter cannot be created or destroyed in a closed system, meaning the total mass of the reactants must always equal the total mass of the products.
What is the first step to solving a stoichiometry problem.
balance the chemical equation
According to legend, this woman is said to wander near rivers, crying for her children
la llorona
Calculate the molar mass of CO₂
12.01 + 2(16.00) = 44.01 g/mol.
What is the mole ratio of CH4 to H2O?
CH₄ + 2O₂ → CO₂ + 2H₂O
1 mol of CH4 : 2 mol of H2O
Daily Double!!
What can and cannot change when balancing a chemical equation?
coefficients can change but subscripts cannot
How can we convert moles of substance to grams of a substance?
molar mass as a conversion factor
What is the fear of spiders called?
Arachnophobia
How many molecules are present in 2.50 mol of H₂O?
1.51 × 10²⁴ molecules H2O
What is the mole ratio of H₂ to NH₃?
N₂ + 3H₂ → 2NH₃
3 mol H₂ : 2 mol NH₃.
Balance: Na + Cl₂ → NaCl.
2Na + Cl₂ → 2NaCl.
DAILY DOUBLE!!
What type of ratio allows you to convert moles of one substance into moles of another?
mole ratio
Who is pennywise?
An alien who can manny forms most commonly a clown
Calculate the molar mass of Ca(OH)₂
40.08 + 2(16.00 + 1.01) = 74.10 g/mol.
How many moles of NH₃ form from 6 mol H₂ ?
N₂ + 3H₂ → 2NH₃
6 mol H₂ × (2 mol NH₃ / 3 mol H₂) = 4 mol NH₃.
Balance the reaction: C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
How many moles of AlCl₃ form from 6 mol Cl₂?
2Al + 3Cl3 → 2 AlCl3
6 mol Cl₂ x (2 mol AlCl3 / 3 mol Cl3) = 4 mol AlCl3
This supernatural creature is commonly described as a blood-drinking monster that attacks livestock.
chupacabra
How many moles are represented by 3.011 × 10²³ molecules of CO₂?
0.500 mol CO₂.
How many moles of Cl₂ are needed to react completely with 5.0 mol Al?
2Al + 3Cl₂ → 2AlCl₃
5.0 mol Al × (3 mol Cl₂ / 2 mol Al) = 7.5 mol Cl₂.
Balance: Fe₂O₃ + CO → Fe + CO₂
Fe₂O₃ + 3CO → 2Fe + 3CO₂.
How many grams of NH₃ forms from 6.0 mol H₂?
N2 + 3H2 -- 2NH3
6.0 mol H₂ x (2 mol NH₃ / 3 mol H₂) x (17.03 g NH3 / 1 mol NH3) = 68 g NH3
What is halloween's original name? What do Catholic celebrate?
All Hallow's Eve
The day before All Saints Day