题干

下列依据热化学方程式得出的结论正确的是w w w.ks 5u.c o m

A:已知2H2(g)+O2(g)=2H2O(g);△H=-483.6 kJ· mol—1,则氢气的燃烧热为241.8 kJ· mol—1

B:已知NaOH(aq)+HCl(aq)=NaCl(aq)+H2O(l);△H=-57.4 kJ· mol—1
则含20.0g NaOH的稀溶液与稀醋酸完全中和,放出小于28.7kJ的热量

C:已知C(石墨,s)=C(金刚石,s);△H>0,则金刚石比石墨稳定

D:己知2C(s)+2O2(g)=2CO2(g));△H=a、2C(s)+O2(g)=2CO(g);△H=b,则a>

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B

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    During the war, my husband was stationed at an army camp in a desert in California. I went to live there in order to be1 him. I hated the place .I had never 2been so unhappy . My husband was ordered out on a long-term duty, and I was left in a tiny shack(棚屋) alone. The heat was3-almost 125 0F even in the shade of a cactus(仙人掌).4a soul to talk to . The wind blew non-stop ,and all the food I ate ,and the every air I breathed, were 5 with sand , sand , sand !

    I was so sorry for myself that I wrote to my parents. I told them I was 6 and coming back home. I said I couldn't stand it one minute longer. I7 be in prison! My father answered my8with just two lines-two lines that will always sing in my9- two lines that completely changed my life :

    Two men looked out from prison bars

    One saw the mud ,the other saw the stars

    I read those two lines10I was ashamed of myself. I made up my mind I would find out what was good in my present11 I would look for the stars.

    I made friends with the natives, and their12amazed me. They gave me presents of their favorite artworks which they had13to sell to tourists . I studied the delightful forms of the cactus . I watched for the desert sunsets, and14for seashells that had been left there millions of years ago when the desert had been an ocean15

    What brought about this16 change in me ? The desert hadn't changed ,17 I had . I had changed my18.And by doing so ,I changed an unhappy experience into the most amazing19of my life . I was excited by this new world that I had discovered I had looked out of my self-created prison and20the stars