18. For a certain reaction at 25.0°C, the value of K is 1.2 × 10⁻³. At 50.0°C the value of K is 3.4 × 10⁻¹. This means that the reaction is

(A) exothermic

(B) endothermic

(C) never favorable

(D) more information needed

(E) none of these (A-D)

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