题干

在铝与稀硫酸的反应中,已知10s末硫酸的浓度减少了0.6mol/L,若不考虑反应过程中溶液体积的变化,则10s内生成硫酸铝的平均反应速率是(   )

A:0.02 mol/(L•min)

B:1.8mol/(L•min)

C:1.2 mol/(L•min)

D:0.18 mol/(L•min)

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答案(点此获取答案解析)

C

同类题4

阅读下面短文,掌握其大意,从短文后各题所给的四个选项A、B、C、D中,选出可以填入空白处的最佳选项。

      He met her at a party. She was outstanding; many guys were after her, but 1 paid any attention to him. After the party, he invited her for coffee. She was surprised. So as not to appear rude, she went 2.

      As they sat in a nice coffee shop, he was too nervous3say anything and she felt uncomfortable. 4, he asked the waiter, "Could you please give me some salt? I'd like to put it in my coffee."

     They stared at him. He turned red, but when the 5 came, he put it in his coffee and drank. Curious, she asked, "6 put salt in the coffee?" He explained, "When I was a little 7, I lived near the sea. I liked playing on the seaside ... I could feel its taste salty, like salty coffee. Now every time I drink it, I 8my childhood and my hometown. I miss it and my parents, 9are still there."

      She was deeply 10. That was the start to their love story.So they married and lived happily together.11 forty years, he passed away and left her a letter which said:My dearest, please forgive(原谅) my life-long 12. Remember the first time we dated? I was so nervous I asked for salt 13sugar. It was hard for me to ask for a change, so I just went ahead. Sweetheart, I don't exactly like salty 14. But as it mattered so much to you, I've learnt to enjoy it. If I could live a 15 time, I hope we can be together again, even if it means that I have to drink salty coffee for the rest of my life.