To determine which chemical equation has the same number of atoms in the reactants as in the products, we need to analyze each equation and count the number of atoms of each element on both sides.
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LICOLIO + CO₂: This equation lacks coefficients or a balanced reaction, so we cannot determine atom counts.
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Zn + 2 HCl → H₂ + ZnCl₂:
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Reactants:
- Zn: 1
- H: 2
- Cl: 2
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Total = 1 Zn + 2 H + 2 Cl = 5 atoms
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Products:
- H: 2
- Zn: 1
- Cl: 2
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Total = 2 H + 1 Zn + 2 Cl = 5 atoms
The number of atoms is the same (5 on each side).
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CO₂ + H₂O → CH₂OH + O₂:
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Reactants:
- C: 1
- O: 3 (2 from CO₂ and 1 from H₂O)
- H: 2
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Total = 1 C + 3 O + 2 H = 6 atoms
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Products:
- C: 1
- H: 2
- O: 3 (2 from CH₂OH and 1 from O₂)
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Total = 1 C + 2 H + 3 O = 6 atoms
The number of atoms is the same (6 on each side).
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C + O₂ → CO₂ + 2 H₂O:
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Reactants:
- C: 1
- O: 2
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Total = 1 C + 2 O = 3 atoms
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Products:
- C: 1
- O: 4 (2 from CO₂ and 2 from 2 H₂O)
- H: 4
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Total = 1 C + 4 O + 4 H = 9 atoms
The number of atoms is not the same (3 on the left, 9 on the right).
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Based on this analysis:
- The equations Zn + 2 HCl → H₂ + ZnCl₂ and CO₂ + H₂O → CH₂OH + O₂ both have the same number of atoms in reactants and products.
- The first equation (LICOLIO + CO₂) is not properly defined; it may be misunderstood.
Thus, the correct choices are the second and third equations (Zn + 2 HCl → H₂ + ZnCl₂ and CO₂ + H₂O → CH₂OH + O₂).