Chromium(VI)  is considered a hazardous, carcinogenic specie…

Chromium(VI)  is considered a hazardous, carcinogenic species, destruction of which may be accomplished by the process shown in the balanced equation below:             4 Zn (s) + K2Cr2O7 (aq) + 7 H2SO4 (aq) → 4 ZnSO4 (s) + 2 CrSO4 (s) + K2SO4 (aq) + 7 H2O (l) Which is the limiting reactant when 0.900moles of H2SO4 and 0.900 moles of  K2Cr2O7 react in excess Zn?