вычислите массу метилацетата полученного из 64 г карбида кальция если выход эфира составляет 80% - Дата: 01.11.2019, Автор: nuria - №18133664

вычислите массу метилацетата полученного из 64 г карбида кальция если выход эфира составляет 80%
- Предмет:
  Химия
- Автор:
  nuria
- 5 лет назад

Ответы 1

CaC2=CH3COOCH3
m(CH3COOCH3)=64*74/64=74
m(т)=74*80/100=59.2г
- Автор:
  westonittr
- 5 лет назад
- 0
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пожалуйста помогите написать пересказ по этому тексту на английском!!!!!!!!!!!!!!!!!!! УМОЛЯЮ!!!!!!!!!!!!

Jimmy Valentine was released' that day.
"Nоw, Valentine," said the warden', "you'll go out today. Make a man of yourself. You are not a bad fellow really. Stop breaking open safes and be honest."
"Me?" said Jimmy in surprise. "Why, I've never broken a safe in my life." The warden laughed. "Better think over my advice, Valentine."
In the evening Valentine arrived in his native town, went directly to the cafe of his old friend Mike and shook hands with Mike. Then he took the key of hisroom and went upstairs. Everything was just as he had left it. Jimmy removed a panel in the wall and dragged out a dust-covered suitcase. He opened it and looked fondly at the finest set of burglar's' tools. It was a complete set made of special steel. The set consisted of various tools of the latest design. Over nine hundreddollars they had cost him.
A week after the release of Valentine there was a new safe-burglary in Richmond. Two weeks after that another safe was opened. That began to interest the detectives. Ben Price, a famous detective, got interested in these cases.
"That's all Jimmy Valentine's work. He has resumed business. He has got the only tools that can open any safe without leaving the slightest trace."
One afternoon Jimmy Valentine came to Elmore, a little town in Arkansas. A young lady crossed the street, passed him at the corner and entered a door over which was the sign "The Elmore Bank". Jimmy Valentine looked into her eyes, forgot what he was and became another man. She lowered her eyes and blushed slightly. Young men of Jimmy's style and looks were not of ten met in Elmore. Jimmy called a boy who was standing on the steps of the bank and began to ask him questions about the town and the people of the town. From this boy he learnt that this girl was Annabel Adams and that her father was the owner of the bank.
Jimmy went to a hotel and registered as Ralf Spencer. To the clerk he said that he had come to Elmore to start business. The clerk was impressed by the clothes and manner of Jimmyand he was ready to give Jimmy any information. Soon Jimmy opened a shoe-store and made large profits. In all other respects he was also a success. He was popular with many important people and had many friends. And he accomplished the wish of his heart. He met Miss Annabel Adams and she fell in love with him too. Annabel's father, whowas a typical country banker approved of Spencer. The young people were to be married in two weeks. Jimmy gave up safe-burglary for ever. He was an honest man now. He decided to get rid of his tools.
At that time a new saf e was put in Mr. Adams' bank. The old man was very proud of it and insisted that everyone should inspect it. So one day the whole family with the children went to the bank. Mr. Adams enthusiastically explained the workings of the safe to Spencer. The two children were delighted to see the shining metal and the funny clock. While they were thus engaged Ben Price, the detective, walked into the bank and stood at the counter watching the scene. He told the cashier that he was just waiting for the man he knew. Suddenly there was a loud scream from the women. Unseen by the elders, May, the smallest girl had shut herself in the vault.
"It's impossible to open the door now," said Mr. Adams in a trembling voice, "because the clock of the safe hasn't been wound. Oh, what shall we do? That child – she can't stand it for long because there isn't enough air there!"
"Get away from the door, all of you," suddenly commanded Spencer. And it must be mentioned that Jimmy happened to have his suit-case with him because he was going to get rid of it that day. Very calmly he took out the tools and in ten minutes the vault was opened. The others watched him in amazement. The little girl, crying, rushed to her mother.
Jimmy took his suit-case and came up to Ben Price whom he had noticed long bef ore. "Hello, Ben", he said, "Let's go. I don't think it matters much now." And then suddenly Ben Price acted rather strangely. "I guess, you are mistaken Mr. Spencer," he said. "I don't seem to recognize you. I think your fiancee' is waiting for you, isn't she?" And Ben Price turned and walked out of the Bank.
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- Автор:
  cirilo
- 5 лет назад
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Помогите ответить на вопросы, текст весь выписала и вопросы внизу.

The story of Robinson Crusoe
(1) Robinson Crusoe, a young man, lives in England. He is eighteen years old. His father wants him to study at university, but Robinson dreams of the sea. he runs away from home and his adventures begin.
(2) One of his sea voyages ends with a shipwreck. Robinson finds himself alone on a desert island,
(3) Robinson lives on the island for twenty-eight years. During these years, he builds himself a house, learns how to fish and to grow plants. He also learns how to cook. At first he feels sad, but then he starts to think that he lives a much better life than he did in Europe.
(4) He does not see ane people for 15 years. Then, one day, he sees a footprint, and later saves a young man. Crusoe names him Friday, because he found him on that day of the week. Friday is extremely frategul and becomes Robinson's servant. He learns some English.
(5) For some years the two live happily. Then, a ship comes to the island. The ship is under pirates control. Crusoe saves the captain of the ship and his men from the pirates and they take him back to England.
(6) There Robinson finds that in his absence he has become a wealthy man. Crusoe gets married and his there children. Later, he visits his old island.

In pairs, answer the questions
1.- Why does Robinson Crusoe run away from home?
2.- How does one of his sea voyages end?
3.- Where does he find himself after a shipwreck?
4.- How long does Robinson stay on the island?
5.- What does he do there?
6.- How long does he live alone?
7.- Whom does he save?
8.- What name does he give him and why?
9.- Does Robinson get back to England?
10.- How does he get back to England?
11.- What does the book end with?
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