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21) Given the following equation, C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g)ΔG°rxn = -2074 kJ Calculate ΔG°rxn for the following reaction. 12 CO2(g) + 16 H2O(g) → 4 C3H8(g) + 20 O2 g) A) -2074 kJ B) +8296 kJ C) -8296 kJ D) +2074 kJ E) -518 kJ 22) Given the following equation, N2O(g) + NO2(g) → 3 NO(g)ΔG°rxn = -23.0 kJ Calculate ΔG°rxn for the following reaction. 2 N2O(g) + 2 NO2(g) → 6 NO(g) A) -23.0 kJ B) 46 kJ C) -46 kJ D) -11.5 kJ E) 23.0 kJ 23) Given the following equation, N2O(g) + NO2(g) → 3 NO(g)ΔG°rxn = -23.0 kJ Calculate ΔG°rxn for the following reaction.   15 NO(g) → 5 N2O(g) + 5 NO2(g) A) -23.0 kJ B) 115 kJ C) -115 kJ D) -4.60 kJ E) 23.0 kJ 24) Estimate ΔG°rxn for the following reaction at 449.0 K. CH2O(g) + 2 H2(g) → CH4(g) + H2O(g) ΔH°= -94.9 kJ; ΔS°= -224.2 J/K A) +5.8 kJ B) +12.9 kJ C) +101 kJ D) +2.4 kJ E) -5.8 kJ 25) Estimate ΔG°rxn for the following reaction at 417 K. HCN(g) + 2 H2(g) → CH3NH2(g)ΔH°= -158.0 kJ; ΔS°= -219.9 J/K A) +61.9 kJ B) -66.3 kJ C) +66.3 kJ D) -250 kJ E) +250 kJ 26) Estimate ΔG°rxn for the following reaction at 875 K. 2 Hg(g) + O2(g) → 2 HgO(s) ΔH°= -304.2 kJ; ΔS°= -414.2 J/K A) -2.63 kJ B) -58.0 kJ C) +58.0 kJ D) +666 kJ E) -666 kJ 27) Determine ΔG°rxn for the following reaction at 338 K. FeO(s) + CO(g) → Fe(s) + CO2(g)ΔH°= -11.0 kJ; ΔS°= -17.4 J/K A) +191.0 kJ B) -5.1 kJ C) +5.1 kJ D) -16.1 kJ E) +16.1 kJ 28) Determine ΔG°rxn for the following reaction at 378 K. CaCO3(s) → CaO(s) + CO2(g)ΔH°= +179.2 kJ; DS°= +160.2 J/K A) +179.2 kJ B) +239.8 kJ C) -239.8 kJ D) +118.6 kJ E) -118.6 kJ 29) The value of ΔG° at 141.0°C for the formation of phosphorous trichloride from its constituent elements, P2(g) + 3Cl2(g) → 2PCl3(g) is ________ kJ/mol. At 25.0°C for this reaction, ΔH° is -720.5 kJ/mol, ΔG° is -642.9 kJ/mol, and ΔS° is -263.7 J/K. A) -612.3 B) 3.65 × 104 C) 1.08 × 105 D) -683.3 E) -829.7 30) The value of ΔG° at 221.0°C for the formation of calcium chloride from its constituent elements: Ca(s) + Cl2(g) → CaCl2(s) is ________ kJ/mol. At 25.0°C for this reaction, ΔH° is -795.8 kJ/mol, ΔG° is -748.1 kJ/mol, and ΔS° is -159.8 J/K. A) -874.8 B) -716.8 C) 7.82 × 104 D) -760.5 E) 3.45 × 104

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