问题
计算题
将250mLH2SO4的质量分数为98%，密度为1.84g/cm3的浓硫酸稀释到1000mL。
（1）此时溶液中H2SO4的物质的量是多少？
（2）此时溶液中H+的物质的量浓度是多少？
(3) 此时把此溶液与足量的锌粉反应，产生的氢气在标准状况下的体积为多少？
答案
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将250mLH2SO4的质量分数为98%，密度为1.84g/cm3的浓硫酸稀释到1000mL。
（1）此时溶液中H2SO4的物质的量是多少？
（2）此时溶液中H+的物质的量浓度是多少？
(3) 此时把此溶液与足量的锌粉反应，产生的氢气在标准状况下的体积为多少？
It was the last day of the final examination in a large eastern university. On the steps of one building, a group of engineering students were talking about the exam that was going to begin in a few 36 . On their faces was confidence . This was their last exam — then on to 37 and jobs. Some talked of jobs they already had; others talked of jobs they 38 get. With the certainty of four years of college, they felt ready and able to take 39 of the world. The coming exam, they knew, would be a(n) 40 task. The professor had said they could bring 41 books or notes they wanted, requesting only that they did not 42 each other, during the test. 43 they entered the classroom. The professor passed out the papers. And smiles 44 on the students’ faces as they noted(注意到) there were only five essay-type questions. Three hours had passed 45 the professor began to collect the papers. The students no longer looked confident. On their faces was a frightened expression. Papers in hand, no one spoke as the professor faced the class. He looked at the 46 faces before him, and then asked, “How many completed all five questions?” 47 a hand was raised. “How many answered four?” Still no hands. “Three? Two?” The students moved restlessly （不安地,慌张地）in their seats. “One, then? Certainly somebody finished 48 .”But the class remained silent. The professor put down the papers. “That is exactly what I 49 ,” he said. “I just want to impress upon you that, 50 you have completed four years of engineering, there are still many things about the 51 you don’t know. These questions you couldn’t answer are relatively(相对地,相当地) 52 in everyday practice. ” Then smiling, he added, “You will all 53 this course, but remember — even though you are now college graduates, your education has just 54 .” The years have 55 the name of this professor, but not the lesson he taught.
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