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Predict the sign of ( ∆H) in each of the following reactions:

NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = -
Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = -
Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -

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