In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?
1. CO2 + H20 -- CH2OH + O2
2. CH4 + O2 -- CO2 + 2H2O
3. Li2CO3 -- LiO + CO2
4. Zn + 2HCI -- H2 + ZnCl2
In option 4, Zn + 2HCI -- H2 + ZnCl2, the number of atoms in the reactants (Zn and 2HCI) is the same as the number of atoms in the products (H2 and ZnCl2).
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is option 3: Li2CO3 -- LiO + CO2.
To determine which chemical equation has the same number of atoms in the reactants as in the products, we need to count the number of atoms on both sides of the equation.
1. CO2 + H2O → CH2OH + O2
Reactants: 1 C atom, 3 O atoms, 2 H atoms
Products: 1 C atom, 3 O atoms, 3 H atoms
The number of atoms in the reactants does not match the number of atoms in the products.
2. CH4 + O2 → CO2 + 2H2O
Reactants: 1 C atom, 4 H atoms, 2 O atoms
Products: 1 C atom, 4 H atoms, 2 O atoms
The number of atoms in the reactants is the same as the number of atoms in the products.
3. Li2CO3 → LiO + CO2
Reactants: 2 Li atoms, 1 C atom, 3 O atoms
Products: 1 Li atom, 1 C atom, 2 O atoms
The number of atoms in the reactants does not match the number of atoms in the products.
4. Zn + 2HCl → H2 + ZnCl2
Reactants: 1 Zn atom, 2 H atoms, 2 Cl atoms
Products: 2 H atoms, 1 Zn atom, 2 Cl atoms
The number of atoms in the reactants does not match the number of atoms in the products.
Therefore, the chemical equation that has the same number of atoms in the reactants as in the products is:
CH4 + O2 → CO2 + 2H2O (Option 2)