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?
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.
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.
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.