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The problem states that the reaction produces hydrogen gas and chloride ions, so the chemical equation can be rewritten as 2HCl(aq)+Zn(s)-->H2(g)+Zn2+(aq)+2Cl-(aq). You can now find all the enthalpies of formation needed to find the enthalpy of the reaction in appendix 2A.
Also, if you're ever unable to find the enthalpy value or any other kind of experimental value, you can always Google it. There's another earlier homework problem in which you needed to use the specific heat capacity of Cu, and for that I just Ok Google'd it because that's really the fastest way to find it if it's not given to you in the problem.
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