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Which equation is an expression of the second law of thermodynamics for a spontaneous process? a) ΔS univ = ΔS sys + ΔS surr > 0 b) ΔH univ = ΔH sys + ΔH surr< 0 c) ΔS univ = ΔS sys + ΔS surr = 0 d) ΔS univ = ΔS sys + ΔS surr < 0