Mole Concepts
What is a mole in chemistry?
A unit used to measure quantity equal to 6.02 × 10²³ particles
How many moles are in 36.0 g of H₂O?
2.00 mol H₂O
How many grams of NH₃ form from 3.00 mol H₂?
N₂ + 3H₂ → 2NH₃
34.0 g NH₃
How many grams of AlCl₃ form from 27.0 g Al?
2Al + 3Cl₂ → 2AlCl₃
134 g AlCl₃
What conversion factor is used to go from moles of one substance to moles of another?
Mole ratio
What is the name of the number 6.02 × 10²³?
Avogadro’s number
How many grams are in 3.00 mol CO₂?
132 g CO₂
How many moles of NH₃ form from 56.0 g N₂?
N₂ + 3H₂ → 2NH₃
4.00 mol NH₃
How many grams of AlCl₃ form from 6.02 × 10²³ particles of Al?
2Al + 3Cl₂ → 2AlCl₃
134 g AlCl₃
What conversion factor is used to go from moles to particles?
Avogadro’s number
What is molar mass?
The mass of one mole of a substance (g/mol)
How many particles are in 0.750 mol O₂?
4.52 × 10²³ particles O₂
How many particles of NH₃ form from 1.00 mol N₂?
N₂ + 3H₂ → 2NH₃
1.20 × 10²⁴ particles NH₃
How many particles of AlCl₃ form from 54.0 g Al?
2Al + 3Cl₂ → 2AlCl₃
1.20 × 10²⁴ particles AlCl₃
What conversion factor is used to go from grams to moles?
Molar mass
What is the difference between mass and quantity?
Mass is how much matter something has; quantity is how many particles there are
How many moles are in 1.204 × 10²⁴ particles of N₂?
2.000 mol N₂
How many moles of NH₃ form from 3.01 × 10²³ particles of H₂?
N₂ + 3H₂ → 2NH₃
0.333 mol NH₃
How many particles of AlCl₃ form from 3.01 × 10²³ particles of Cl₂?
2Al + 3Cl₂ → 2AlCl₃
2.01 × 10²³ particles AlCl₃
Can you convert directly (using one conversion factor) from moles Fe to grams Fe? If no, explain why.
In a balanced equation, what conversion factor do coefficients represent?
Mole ratio
How many moles are in 98.0 g of H₂SO₄?
1.00 mol H₂SO₄
How many moles of NH₃ form from 6.00 g H₂?
N₂ + 3H₂ → 2NH₃
2.00 mol NH₃
How many particles of AlCl₃ form from 35.5 g Cl₂?
2Al + 3Cl₂ → 2AlCl₃
2.01 × 10²³ particles AlCl₃
Can you convert directly from particles of C to moles of Fe?
No - You need to convert from particles of C to moles of C (Avogadro's number) then from moles of C to moles of Fe (mole ratio).
You need at least one similarity between units on conversion factors between top and bottom:
part. C/mol Fe = different unit and different compound
part. C/mol C = same compound
mol C/mol Fe = same unit