Question

In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products

LICOLIO + CO2

Zn+2HCI-H2 + ZnCl2

CO₂H₂O-CH2OH + O2

CH+O2 CO2 + 2H2O

Answer 1

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.

1. **LICOLIO + CO₂**: This equation lacks coefficients or a balanced reaction, so we cannot determine atom counts.

2. **Zn + 2 HCl → H₂ + ZnCl₂**:
- Reactants:
- Zn: 1
- H: 2
- Cl: 2
- Total = 1 Zn + 2 H + 2 Cl = 5 atoms

- Products:
- H: 2
- Zn: 1
- Cl: 2
- Total = 2 H + 1 Zn + 2 Cl = 5 atoms

The number of atoms is the same (5 on each side).

3. **CO₂ + H₂O → CH₂OH + O₂**:
- Reactants:
- C: 1
- O: 3 (2 from CO₂ and 1 from H₂O)
- H: 2
- Total = 1 C + 3 O + 2 H = 6 atoms

- Products:
- C: 1
- H: 2
- O: 3 (2 from CH₂OH and 1 from O₂)
- Total = 1 C + 2 H + 3 O = 6 atoms

The number of atoms is the same (6 on each side).

4. **C + O₂ → CO₂ + 2 H₂O**:
- Reactants:
- C: 1
- O: 2
- Total = 1 C + 2 O = 3 atoms

- Products:
- C: 1
- O: 4 (2 from CO₂ and 2 from 2 H₂O)
- H: 4
- 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).

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).