A student measured q_rxn for the reaction of 0.330 g of a metal, X(s)(molar mass = 79.02), with HCl(aq) to be -893 J. Assuming this metal reacts in the same manner as magnesium, what is the H_f(in kJ/mol) for this metal's cation in solution, i.e., X²⁺(aq)? Report your answer to the correct number of significant figures and only include the numerical answer (no units).