Manganese reacts with hydrochloric acid to produce manganese (II) chloride and hydrogen gas. Mn(s)+2HCl(aq)MnCl2(aq)+H2(g) When 0.610g Mn is combined with enough hydrochloric acid to make 100.0mL of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from 23.4C to 29.5C. Find Hrxn for the reaction as written. (Assume that the specific heat capacity of the solution is 4.18J/gC and the density is 1.00g/mL.) 230kJ 4.18kJ 1.40kJ 2.55kJ