Use the table below to answer the questions that follow: Substance ∆G (kJ/mol) C(graphite) 0 H2(g) 0 C2H2 209.2 SO2(g) -300.4 O2(g) 0 SO3(g) 370.4 CaCO3(g) -1128.8 CaO(s) -604. 17 CO2 -394.4   Calculate the ∆G for the following reactions and predict whether the reaction is spontaneous or not. Use the Gibbs free energy formation provided and this ∆Grxn= Σ∆Gproducts - Σ∆Greactants to be more specific.   ______1. 2C(graphite)+ H2(g) à C2H2(g) -209.2 kJ (spontaneous) 0 kJ (equilibrium) 2 kJ (nonspontaneous) None of the above   _______2. SO2(g) + 1/2O2(g)  à SO3(g) -70 kJ (spontaneous) 70 kJ (nonspontaneous) 8 kJ (nonspontaneous) -670.8 kJ (spontaneous)   _______3. CaCO3(g) à CaO(s) + CO2(g) 0 kJ (equilibrium) 0 kJ (spontaneous) 2 kJ (spontaneous) None of the above

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