Yes it is already balanced.
I don't feel like pulling up a periodic table, but the letters stand for the state of the molecule, aq= Aqueous/ g= gaseous/ s= solid

right on, i was just checking on my paper to see if i was
does it matter what the state of the molecule is? or is it just something thrown in there to confuse me?

For the purpose of this question and likely any you're going to be receiving, it doesn't matter.

Edit: I take back that last part. It will come into play for you when they give you info in terms of volumes. --> Using density to convert to mass for solids/liquids and ideal gas for to convert to mass for gasses.
But for this question it doesn't matter

This post was edited by RzChaos on Mar 8 2015 09:10pm

We are going to be learning volumes in the next few days

This post was edited by Jizzmoe on Mar 8 2015 09:13pm

66.37%

?

This post was edited by Jizzmoe on Mar 8 2015 09:22pm