2. \( \text{H}_2(\text{g}) \) 和 \( \text{O}_2(\text{g}) \) 在絕熱鋼瓶中反應生成水,則:(A) \( \Delta \text{H} = 0 \)(B) \( \Delta \text{U} = 0 \)(C) \( \Delta \text{S} = 0 \)(D) \( \Delta \text{G} = 0 \)