题干

用CO通过下列方法可以合成甲醇。

①CO2(g)+2H2O(l) === CH3OH(g)+

3
2
O2(g) ΔH1=+764.5 kJ·mol1

②CO(g)+

1
2
O2(g)===CO2(g) ΔH2=-283.0 kJ·mol1

③H2(g)+

1
2
O2(g)===H2O(l) ΔH3=-285.8 kJ·mol1

下列有关说法正确的是(    )

A:反应①使用催化剂可以提高甲醇产率

B:反应②在任何条件下均能自发进行

C:反应③在100℃时ΔH<-285.8 kJ·mol1

D:反应CO(g)+2H2(g) CH3OH(g)的ΔH=-90.1 kJ·mol1

上一题 下一题 0.0难度 选择题 更新时间:2019-05-20 11:16:22

答案(点此获取答案解析)

D

同类题3

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

    One rainy afternoon I was sitting at home feeling so bored.1 feeling sorry for myself, I wanted to meet people and have new2, so I decided to start volunteering. I found a website where I could volunteer on a farm in France.

    Volunteering 3 so many opportunities to have fun and share 4stories. It was the first time for me to work on a farm. It was almost a(n)5holiday as food and accommodation were provided. It was not one6 holiday, however, as I had to 7 fifteen horses and sheep! I soon discovered that I was a(n) 8 farmer but it did not matter because I made some great friends and also improved my9.

    However, you do not 10 go abroad to volunteer. I have had plenty of adventures at home as volunteering can become a11. For example, I love12 so I had a good laugh waving my arms in order to 13my local choir(合唱团). At university, I organized a concert for charity with my friends. It was really 14 to find bands and raise money for a cause.

    It is true that you feel good volunteering but there are also other 15.I once volunteered as a steward (干事) at a charity sports event where the organizers 16 gave me cupcakes from an expensive London bakery to thank me for my 17. I also volunteered in a charity shop so I found loads of nice cheap clothes to 18my wardrobe(衣橱).

    While this is all fun, my favourite aspect of volunteering is 19and sharing stories. My terrible20  at farming has given me funny stories to tell!

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