Question

4HCl(aq) + MnO2(s) →2H2O(l) + MnCl2(aq) + Cl2(g) 

Answer 1

what to do in this?.......

Answer 2

MnO2(s) + 4HCl(aq) → Cl2(g) + MnCl2(aq) + 2H2O(l)

it is a reaction used to produce chlorine gas

note that HCl solution (36.0% HCl by mass) is needed to produce 2.50 g of Cl