Zinc metal reacts with hydrochloric acid according to the following balanced equation:

Zn(s)+2HCl(aq)→ZnCl2(aq)+H2(g)

When 0.108 g
of Zn(s)
is combined with enough HCl
to make 54.3 mL
of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature of the solution from 22.3 ∘C
to 24.7 ∘C
.Find ΔHrxn
for this reaction as written. (Use 1.00 g/mL
for the density of the solution and 4.18 J/(g⋅∘C)
as the specific heat capacity.)
Express your answer in kilojoules per mole to two significant figures.