Предмет: Химия, автор: Nichka040402

Какой объём (н.у.) оксида углерода (IV) образуется при взаимодействии 60 г карбоната кальция, содержащего 8% примесей (примеси в реакцию не вступают!), с азотной кислотой, если выход составляет 90% от теоретичес

Ответы

Автор ответа: gavrilka

CaCO3 + 2HNO3 -> Ca(NO3)2 + CO2 + H2O
m(CaCO3) = 60 - 60*0,08=55,2 г
55,2/100=x/22,4 => 12,36 л (теоретический выход)
ПВ=Vпр*100%/Vтеор => Vпр=ПВ*Vтеор/100% => Vпр=90*12,36/100=11,12 л
Ответ: 11,12 л

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Paraphrase the sentences using phrases from the text:
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2)Everybody tried to help him to find some kind of job.
3)Their concern and hospitality were very important to him.
4)He told Colonel Pope that he was unemployed and needed any job very much.
5)The man thought that everything would be lost for him if he didn't find a job.
6)He had never ridden a bicycle in his life.
7)Mr. Wilmot neither employed the journalist nor dismissed him.
8)The boss made him responsible for the uptown rink.
9) It suddenly occurred to him that his willingness to do any job had helped him to get his first job.

Вопросы на них надо дать ответы.

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2)In what way was he received? Why was it of great importance to him?
3)What made the young man apply for a job to the Pope Company?
4)Describe Colonel Pope. What was his answer to the young man's sto-
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5)Why did the man still hang on though he found out that the company was laying off hands?
6)What question did the Colonel ask him? Describe the young man's job and say whether he coped with it.
7)Why did the man continue to work for Mr. Wilmot though he hadn't engaged him?
8)What happened at the end of the week?
9)What job was the young man offered in the long run?
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