# Chlorine gas, Cl_2, reacts with potassium bromide, KBr, to form potassium chloride and bromine, Br_2. How do you write the balanced equation for this single-displacement reaction?

Jan 1, 2016

$\text{Cl"_2" + 2KBr}$$\rightarrow$$\text{2KCl" + "Br"_2}$

#### Explanation:

Unbalanced Equation

$\text{Cl"_2" + KBr}$$\rightarrow$$\text{KCl" + "Br"_2}$

Balance the Cl

There are 2 Cl atoms on the left side and 1 Cl atom on the right side.

Add a coefficient of 2 in front of KCl on the right side.

$\text{Cl"_2" + KBr}$$\rightarrow$$\text{2KCl" + "Br"_2}$

There are now 2 Cl atoms on both sides.

Balance the Br

There are 2 Br atoms on the right side and 1 Br atom on the left side. Add a coefficient of 2 in front of KBr.

$\text{Cl"_2" + 2KBr}$$\rightarrow$$\text{2KCl" + "Br"_2}$

The equation is now balanced with 2 Cl atoms, 2 K atoms, and 2 Br atoms on both sides of the equation.

Note: You can substitute the words atom or atoms by mole or moles.