J.R. S. answered 10/07/22
Ph.D. University Professor with 10+ years Tutoring Experience
Fe(s) + 2 HCl(aq) ==> FeCl2(s) + H2(g)
∆Hrxn = ∑∆Hfproducts - ∑Hfreactants
6.6 kJ = (-341.79 + 0) - (0 + 2x)
6.6 = -341.79 - 2x
2x = -348.39
x = -174.2 kJ / mol HCl
** The question asks for ∆Hf for HCl but then it gives the ∆Hf for HCl as -92.3 kJ/mole. Was that supposed to be an option or was that the actual value? Not sure exactly what is given and what is asked for in this question.