what is the ΔS Zn of this equation (s) + HCl (aq) → ZnCl2 (aq) + H2 (g)

Question

is it positive or negative

Answer 1

You haven't provided enough information for this to be answered properly. You probably have a table of ∆S values, or you can look one up in your book or on the internet. Also, your reaction should read

Zn(s) + 2HCl(aq) ==> ZnCl2(aq) + H2(g). This is the balanced equation.

Then it will be the sum of ∆S of the products - the sum of ∆S of the reactants = ∆Sreaction. In equation form it will be: ∑(2x∆SZnCl2 + ∆SH2) - ∑(∆SZn + 2x∆SHCl) = ∆Sreaction