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Choose the one alternative that best completes the statement or answers the question. At 2600 K, ΔG° = 775 kJ for the vaporization of boron carbide: B4C(s)⇌4 B(g) + C(s) Find ΔG and determine if the process is spontaneous if the reaction vessel contains 4.00 mol B4C(s), 0.400 mol of C(s), and B(g) at a partial pressure of 1.0 × 10-5 atm. At this temperature,RT = 21.6 kJ. A) ΔG = -270 kJ; spontaneous. B) ΔG = -220 kJ; spontaneous. C) ΔG = -270 kJ; nonspontaneous. D) ΔG = -220 kJ; nonspontaneous.