Balancing Equations
Balance:
H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
Identify the reaction type:
A + B → AB
Synthesis (Combination)
How many grams are in 1 mole of NaCl?
Molecular mass of Na: 23 g/mol
Molecular Mass of Cl: 35.5 g/mol
58.5 g
How many moles are in 34 g of H₂O2?
Molecular mass of H: 1 g/mol
Molecular mass of O: 16 g/mol
1 mole
How many particles are in 1 mole of a substance?
6.02 × 10²³
Balance:
Na + Cl₂ → NaCl
2Na + Cl₂ → 2NaCl
Identify the reaction type:
AB → A + B
Decomposition
Convert 2 moles of CO₂ to grams.
Molecular mass of C:12 g/mol
Molecular mass of O: 16 g/mol
88 g
Convert 56 g of CO to moles.
Molecular mass of C: 12 g/mol
Molecular mass of O: 16 g/mol
2 moles
How many atoms are in 2 moles of He?
1.20 × 10²⁴ atoms
Balance:
Al + O₂ → Al₂O₃
4Al + 3O₂ → 2Al₂O₃
Identify the reaction type:
Zn + CuSO₄ → ZnSO₄ + Cu
Single Replacement (Single Displacement)
Convert 0.50 moles of H₂O to grams.
Molecular mass of H: 1 g/mol
Molecular mass of O: 16 g/mol
9.0 g
Convert 98 g of H₂SO₄ to moles.
Molecular mass of H: 1 g/mol
Molecular mass of S: 32 g/mol
Molecular mass of O: 16 g/mol
1 mole
How many molecules are in 0.25 moles of CO₂?
1.51 × 10²³ molecules
Balance:
C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Identify the reaction type:
AgNO₃ + NaCl → AgCl + NaNO₃
Double Replacement (Double Displacement)
Convert 3.25 moles of CaCO₃ to grams.
Molecular mass of Ca: 40 g/mol
Molecular mass of C: 12 g/mol
Molecular mass of O: 16 g/mol
325 g
Convert 150 g of NaCl to moles.
Molecular mass of Na: 23 g/mol
Molecular mass of Cl: 35.5 g/mol
2.56 moles
How many moles are in 3.01 × 10²³ atoms of Na?
0.50 moles
Balance:
Fe₂O₃ + CO → Fe + CO₂
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Identify the reaction type:
CH₄ + O₂ → CO₂ + H₂O
Combustion
Convert 0.075 moles of Al₂O₃ to grams.
Molecular mass of Al: 27 g/mol
Molecular mass of O: 16 g/mol
7.65 g
Convert 12.0 g of MgO to moles.
Molecular mass of Mg: 24 g/mol
Molecular mass of O: 16 g/mol
0.30 moles
How many oxygen atoms are in 1 mole of H₂SO₄?
4 moles of O atoms (2.41 × 10²⁴ atoms)