[achibaby1974]

Calculate the maximum number of moles and mass of iodic acid that can form when 632 g iodine trichloride reacts with 112.4g water.

I'm pretty sure this is a limiting reactant problem so it's not that bad.

But I can't balance this:

     ICl3 +   H20       ------>        ICl +         HIO3 +        HCl

What mass of the excess reactant remains?       g
What is the reactant? HCl or ICl3

UPDATE:
ok. now i can balance it.

2 ICl3 +  3 H2O --------> 1 ICl + 1 HIO3 + 5 HCl

yay!. i'm a big kid now. (Huggies theme ) anyhoo, what do i do after this? Basically, what "excess reactant" are they talking about?


P.S. - Is there any really good website that lists all the polyatomic ions (not just the common ones) or a website that can quiz me on 'em? 

[Arkcon]

You now have a balanced equation 2 of ICl₃ plus 3 of H₂O.  But 2 and 3 what? 

Answer: A balanced equation is in units of moles.  You been given reactants in units of mass.  You have to convert first.

[achibaby1974]

okay i got the first two right b/c those are limiting reactants

max. # of moles and mass of HIO3. w/

If ICL3 is the limiting reactant ----- 1.35 mol HIO3
If H20 is the limiting reactant --------- 2.08148 mol of HIO3

So, ICl3 is the limiting reactant. The excess reactant is H20. So, .

Why can't I just use the 112.4g H2O that they gave me and multiply with molar mass?

[achibaby1974]

THANKS. I got it.