# How do you balance #P_4 + O_2 -> 2P_2O_3#?

##### 1 Answer

Count the number of atoms on each side to make sure they have the same number of atoms.

On the left side (or left of arrow),

P = 1

O = 1

On the right side

P = 2

O = 2

P is balanced but O isn't.

Find the lowest common multiple (LCM) of number of atoms present in O.

The LCM between 2 and 6 is 6.

On the left hand side, we need to make the number of atoms of O from 2 to become 6 by multiplying 3.

So insert a 3 in front of

Check your equation now:

Now double check to make sure the number of atoms are same on both side. - IMPORTANT

P = 4 atoms on left side and 4 atoms on right side - BALANCED

O = 6 atoms on left side and 6 atoms on right side - BALANCED

If they're all balanced, you're good to go write your balanced equation.

Overall, your balanced equation should look like: