How many milliliters of a 6.00 molar hydrochloric acid (hcl) solution would be needed to react completely with 100.0 grams of iron metal? 2fe (s) + 6hcl (aq) yields 2fecl3 (aq) + 3h2 (g)?

The balanced equation for the above reaction is as follows;
2Fe + 6HCl --> 2FeCl₃  + 3H₂
stoichiometry of Fe to HCl is 2:6
number of Fe moles reacted - 100.0 g/ 56 g/mol = 1.79 mol
if 2 mol of Fe reacts with 6 mol of HCl 
then 1.79 mol of Fe reacts with - 6/2 x 1.79 = 5.37 mol
the number of HCl moles required are 5.37 mol
if 6.00 mol of HCl are in 1 L volume of HCl solution
then volume required for 5.37 mol are in - 5.37 mol / 6.00 mol/L = 0.895 L
therefore volume required is 895 mL 

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Must be negative.substance increases