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Choose the one alternative that best completes the statement or answers the question. At 25°C, ΔG°f is -620 kJ/mol for SiCl4(g) and -592 kJ/mol for MgCl2(s). Calculate ΔG° for the reaction, SiCl4(g) + 2 Mg(s) →2 MgCl2(s) + Si(s) and determine if the reaction is spontaneous at 25°C if the pressure of SiCl4(g) is 1 atm. A) ΔG° = 28 kJ; the process is nonspontaneous. B) ΔG° = 28 kJ; the process is spontaneous. C) ΔG° = -564 kJ; the process is spontaneous. D) ΔG° = -564 kJ; the process is nonspontaneous.