Mole Conversions
How many moles are in 5.60 L of a gas at STP?
0.250 mol
Find the molar mass of K₂SO₄
174.26 g/mol
Balance:
__ Al + __ O₂ → __ Al₂O₃
4Al + 3O₂ → 2Al₂O₃
N₂ + 3H₂ → 2NH₃
How many moles NH₃ form from 3.0 mol H₂?
2.0 mol NH₃
2H₂ + O₂ → 2H₂O
If 4 mol H₂ reacts with 1 mol O₂, identify the limiting reactant
O₂
How many molecules of CO₂ are in 0.600 mol CO₂?
3.61 × 10²³ molecules
A compound contains:
40.0% C
6.7% H
53.3% O
Find the empirical formula
CH₂O
Balance:
__ C₃H₈ + __ O₂ → __ CO₂ + __ H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
2Mg + O₂ → 2MgO
How many grams MgO form from 1.55 mol Mg?
62.5 g
N₂ + 3H₂ → 2NH₃
If 5 mol N₂ react with 9 mol H₂, which reactant is limiting?
H₂
How many grams of N₂ are in 2.75 mol N₂?
77.0 g
Empirical formula = CH₂O
Molar mass = 150 g/mol
Find the molecular formula
C₅H₁₀O₅
Predict the products and balance:
Na₃PO₄ + AgNO₃ →
Na₃PO₄ + 3AgNO₃ → Ag₃PO₄ + 3NaNO₃
(Double replacement)
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
How many moles CO₂ form from 1.50 mol C₂H₆?
3.00 mol CO₂
2Al + 3Cl₂ → 2AlCl₃
If 8.00 mol Al react with 9.00 mol Cl₂, how many moles AlCl₃ form?
6.00 mol AlCl₃
How many grams of CO₂ are present in 6.72 L CO₂ at STP?
13.2 g
A compound contains:
63.2% Fe
36.8% O
Find the empirical formula
FeO2
Predict the products and type:
Fe + CuCl₂ →
Hint: Iron (II)
Fe + CuCl₂ → FeCl₂ + Cu
Single replacement
Fe₂O₃ + 3CO → 2Fe + 3CO₂
How many grams Fe form from 80.0 g Fe₂O₃?
55.9 g Fe
2Al + 3Cl₂ → 2AlCl₃
If 8.0 mol Al react with 9.0 mol Cl₂, how many moles of excess reactant remain?
2.0 mol Al
How many molecules of H₂O are in 0.900 mol H₂O?
5.42 × 10²³ molecules
A compound contains:
40.0% C
6.7% H
53.3% O
Molar mass = 60 g/mol
Find the molecular formula
C₂H₄O₂
Predict the products and balance:
BaCl₂ + Na₂SO₄ →
BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl
Double replacement
2Al + 3Cl₂ → 2AlCl₃
How many grams AlCl₃ form from 12.0 g Al?
59.3 g AlCl₃
CaCO₃ → CaO + CO₂
A student heats 60.0 g CaCO₃ and collects 30.0 g CaO.
What is the percent yield?
89.2%