Answer to Question #36302 in Inorganic Chemistry for LuAie Dia

Question #36302
Zinc metal reacts with hydrochloric acid according to this balanced equation.
Zn(s)+2HCl(aq)→ZnCl 2 (aq)+H 2 (g) \rm Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g)
When 0.124g g of Zn(s) \rm Zn(s) is combined with enough HCl {\rm HCl} to make 50.3mL mL of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 21.8 ∘ C ^\circ C to 24.7 ∘ C ^\circ C. Find ΔH rxn \Delta {\kern 1pt} H_{{\rm{rxn}}} for this reaction as written. (Use 1.0 g/mL {\rm{g}}/{{\rm{mL}}} for the density of the solution and 4.18 J/g⋅ ∘ C {\rm{J}}/{{\rm{g}} \cdot {\rm{^\circ C}}} as the specific heat capacity.)
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