Question

in which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products would it be CH4 + 02C02 plus 2H20 or LI2 CO three and then LIO plus CO2 or would it be ZN +2 HCI– H2 plus ZNC2 and last would it be CO2 plus H2O – CH20 +02

Answer 1

To determine which of the chemical equations has the same number of atoms in the reactants as in the products, we'll need to balance each equation.

1. **CH₄ + 2 O₂ → CO₂ + 2 H₂O**
- Reactants: 1 C (from CH₄) + 4 H (from CH₄) + 4 O (from 2 O₂) = 1 C + 4 H + 4 O
- Products: 1 C (from CO₂) + 4 H (from 2 H₂O) + 2 O (from CO₂ and 2 H₂O) = 1 C + 4 H + 4 O
- This equation is balanced—same number of atoms in reactants and products.

2. **Li₂CO₃ → Li₂O + CO₂**
- Reactants: 2 Li + 1 C + 3 O = 2 Li + 1 C + 3 O
- Products: 2 Li + 1 O + 1 C + 2 O = 2 Li + 1 C + 3 O
- This equation is also balanced.

3. **Zn + 2 HCl → H₂ + ZnCl₂**
- Reactants: 1 Zn + 2 H + 2 Cl = 1 Zn + 2 H + 2 Cl
- Products: 1 H + 1 H + 1 Zn + 2 Cl = 1 Zn + 2 H + 2 Cl
- This equation is balanced.

4. **CO₂ + H₂O → CH₂O + O₂**
- Reactants: 1 C + 2 O + 2 H = 1 C + 2 O + 2 H
- Products: 1 C + 2 H + 1 O + 2 O = 1 C + 2 H + 3 O
- This equation is not balanced—there's an extra O in the products.

Based on the analysis above:

- The first equation (CH₄ + 2 O₂ → CO₂ + 2 H₂O) is balanced.
- The second equation (Li₂CO₃ → Li₂O + CO₂) is balanced.
- The third equation (Zn + 2 HCl → H₂ + ZnCl₂) is balanced.
- The fourth equation (CO₂ + H₂O → CH₂O + O₂) is not balanced.

Therefore, the first three reactions have the same number of atoms in the reactants as in the products.