To determine if the given chemical equations are balanced or unbalanced, we need to compare the number of atoms of each element on both sides of the equation.
-
N2 + H2 → 2NH3
- Reactants:
- N: 2 (from N2)
- H: 2 (from H2)
- Products:
- N: 2 (from 2NH3)
- H: 6 (from 2NH3)
- This equation is UNBALANCED (2 hydrogen atoms on the left, 6 on the right).
- Reactants:
-
2C2H6 + 7O2 → 4CO2 + 6H2O
- Reactants:
- C: 4 (from 2C2H6)
- H: 12 (from 2C2H6)
- O: 14 (from 7O2)
- Products:
- C: 4 (from 4CO2)
- H: 12 (from 6H2O)
- O: 14 (from 4CO2 and 6H2O)
- This equation is BALANCED.
- Reactants:
-
4ZnS + 6O2 → 4ZnO + 4SO2
- Reactants:
- Zn: 4 (from 4ZnS)
- S: 4 (from 4ZnS)
- O: 12 (from 6O2)
- Products:
- Zn: 4 (from 4ZnO)
- S: 4 (from 4SO2)
- O: 12 (from 4ZnO and 4SO2)
- This equation is BALANCED.
- Reactants:
-
2Fe2O3 + 3C → Fe + 3CO2
- Reactants:
- Fe: 4 (from 2Fe2O3)
- O: 6 (from 2Fe2O3)
- C: 3
- Products:
- Fe: 1 (from Fe)
- O: 6 (from 3CO2)
- C: 3 (from 3CO2)
- This equation is UNBALANCED (4 iron atoms on the left, 1 on the right).
- Reactants:
-
C3H8 + 5O2 → 3CO2 + 4H2O
- Reactants:
- C: 3 (from C3H8)
- H: 8 (from C3H8)
- O: 10 (from 5O2)
- Products:
- C: 3 (from 3CO2)
- H: 8 (from 4H2O)
- O: 10 (from 3CO2 and 4H2O)
- This equation is BALANCED.
- Reactants:
Summary:
- 1st equation: UNBALANCED
- 2nd equation: BALANCED
- 3rd equation: BALANCED
- 4th equation: UNBALANCED
- 5th equation: BALANCED
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