MOLES
How many moles are in 22.4 L of gas at STP?
1.0 mol
Find the molar mass of CO₂
44.01 g/mol
What type of reaction is:
A + B → AB
Synthesis
2H₂ + O₂ → 2H₂O
How many moles H₂O form from 2 mol H₂?
2 mol H₂O
The reactant that runs out first is called the:
Limiting reactant
How many liters at STP are in 2.0 mol of gas?
44.8 L
Find the molar mass of NaOH
39.996 g/mol
What type of reaction is:
AB → A + B
Decomposition
N₂ + 3H₂ → 2NH₃
How many moles NH₃ form from 1 mol N₂?
2 mol NH₃
2H₂ + O₂ → 2H₂O
If 4 mol H₂ react with 1 mol O₂, which is limiting?
O₂
How many molecules are in 0.50 mol CO₂?
3.01 × 10²³ molecules
A compound contains:
50% sulfur
50% oxygen
Find the empirical formula
SO2
Predict the products:
AgNO₃ + NaCl →
AgCl + NaNO₃
N₂ + 3H₂ → 2NH₃
If 15.0 L of H₂ reacts at STP, how many liters of NH₃ are produced at STP?
10.0 L
N₂ + 3H₂ → 2NH₃
If 3 mol N₂ react with 3 mol H₂, which is limiting?
H₂
How many grams of O₂ are in 1.50 mol O₂?
48.0 g
Empirical formula = NO₂
Molar mass = 92 g/mol
Find the molecular formula
N₂O₄
Identify the reaction type:
Zn + CuSO₄ → ZnSO₄ + Cu
Single replacement
4NH₃ + 5O₂ → 4NO + 6H₂O
If 6.02 × 10²³ molecules of NH₃ react completely, how many molecules of NO are produced?
6.02 × 10²³ molecules NO
2Al + 3Cl₂ → 2AlCl₃
If 10 mol Al reacts with 12 mol Cl₂, which reactant is limiting?
Cl₂
How many atoms of hydrogen are in 2.0 mol H₂O?
2.41 × 10²⁴ H atoms
A compound contains:
40.0% C
6.7% H
53.3% O
Find the empirical formula
CH₂O
Predict the products and balance:
K₂CO₃ + CaCl₂ →
CaCO₃ + 2KCl
CaCO₃ → CaO + CO₂
If 25.0 g of CaCO₃ decomposes completely, how many molecules of CO₂ are produced?
1.50 × 10²³ molecules CO₂
A reaction has a theoretical yield of 30 g and the student collects 24 g.
Find the percent yield.
80%