# Help with question about mols in reactions

Consider the following reaction

$$\ce{4H2O + 5I2O4 -> 8HIO3 + I2}$$

If 0.167 mol of $$\ce{H2O}$$ is added to 0.200 mol of $$\ce{I2O4}$$ what amount (moles) of $$\ce{HIO3}$$ can be formed, it the reaction goes to completion?

(A) 0.084 mol

(B) 0.125 mol

(C) 0.320 mol

(D) 0.334 mol

Can someone please explain the answer to this problem. I have been at it for ages and keep coming up with an answer close to C but not close enough to count it! Help!

• Which of the reagents is in excess? – Ivan Neretin Apr 11 '19 at 8:54