This is an **oxidation-reductio***n (redox) reaction:*

*2 Cl0 + 2 e- → 2 Cl-I (reduction)*

*2 Ba0 - 2 e- → 2 BaI (oxidation)*

*Cl2* is an **oxidizing** agent, *Ba* is a **reducing** agent.

### Input interpretation

** **

** *** Ba + C**l**2** → BaC**l**2*

** Barium chlorine barium chlorine**

### Balanced equation

Balance the chemical equation algebraically:

* Ba + C**l**2** → BaC**l**2*

Add stoichiometric coefficients, c, to the reactants and products:

* C1 Ba + C2 Cl2 → C3 BaCl2*

Set the number of atoms in the reactants equal to the number of atoms in the products for **Ba** and **Cl**:

*Ba: C1=C3*

*Cl: 2c2=C3*

Since the coefficients are relative quantities and underdetermined, choose a coefficient to set arbitrarily. To keep the coefficients small, the arbitrary value is ordinarily one. For instance, set c2 = 1 and solve the system of equations for the remaining coefficients:

* c1=2 C2=1*

* C3 = 2*

Substitute the coefficients into the chemical reaction to obtain the balanced equation:

### Answer:

* Ba + C**l**2** → BaC**l**2*