To determine which equation is balanced, we need to check if the number of atoms of each element on the reactant side matches the number on the product side for each equation.
Let's analyze each option individually.
A. C8H8 + 5O2 → 3CO2 + 4H2O
- Reactants:
- C: 8
- H: 8
- O: 5 × 2 = 10
- Products:
- C: 3 × 1 = 3
- H: 4 × 2 = 8
- O: 3 × 2 + 4 × 1 = 6 + 4 = 10
This equation is not balanced (carbon is not balanced).
B. C8H8 + 10O2 → 8CO2 + 4H2O
- Reactants:
- C: 8
- H: 8
- O: 10 × 2 = 20
- Products:
- C: 8 × 1 = 8
- H: 4 × 2 = 8
- O: 8 × 2 + 4 × 1 = 16 + 4 = 20
This equation is balanced.
C. C8H8 + 4O2 → 3CO2 + 3H2O
- Reactants:
- C: 8
- H: 8
- O: 4 × 2 = 8
- Products:
- C: 3 × 1 = 3
- H: 3 × 2 = 6
- O: 3 × 2 + 3 × 1 = 6 + 3 = 9
This equation is not balanced (both carbon and hydrogen are not balanced).
D. C8H8 + 2O2 → CO2 + 4H2O
- Reactants:
- C: 8
- H: 8
- O: 2 × 2 = 4
- Products:
- C: 1 × 1 = 1
- H: 4 × 2 = 8
- O: 1 × 2 + 4 × 1 = 2 + 4 = 6
This equation is not balanced (carbon is not balanced).
Conclusion: The only correctly balanced equation is B: C8H8 + 10O2 → 8CO2 + 4H2O.
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