A:-37.8 kJ·mol-1，Kθ = 12 B:37.8 kJ·mol-1，Kθ = 1.2  C:37.8 kJ·mol-1，Kθ = 12 D:-37.8 kJ·mol-1，Kθ = 1.2 答案: 37.8 kJ·mol-1，Kθ = 1.2