Предмет: Химия, автор: eerrrroooorrrr

ДАЮ 200 балів
Який об'єм амоніаку (н.у.) потрібний для приготування його розчину масою 200 г з масовою часткою 17%

Ответы

Автор ответа: dyexfnf
0

Ответ:

Объяснение:

Дано:

m(р-нNH₃) = 200 г.

ω%(NH₃) = 17% = 0,17

Найти:V(NH₃)-?

Визначимо масу амоніаку в розчині:

m(NH₃) = m(р-нNH₃) * ω%(NH₃) = 200 * 0,17 = 34 г

Знайдемо кількість речовини NH₃:

М(NH₃) = 14 + 1 * 3 = 17 г/моль

n(NH₃) = m(NH₃)/М(NH₃) = 34/17 = 2 моль

Обчислимо об'єм амоніаку потрібний для приготування його розчину:

V(NH₃) = n(NH₃) * Vm = 2 * 22,4 = 44,8 л

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Test. Reading comprehension
Read the text "Nellie Bly". Exercise 1(b)page 233,234,235 and answer the questions:
1. What made many people angree in the late 1800's?
2. What story was published one day in a Pittsburg newspaper ?
3. Did the most people agree with the story?
4. Was anybody who did not agree with the story?
5. How old was E.Cochrane?
6. Why did Elizabeth need a job?
7. What kind of stories did Elizabeth write?
8. In what towns did Elizabeth work?
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NELLIE BLY

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One day a Pittsburgh newspaper published a story that said that a woman should work only at home. Many people who read it wrote letters to the editor. Most of them agreed with the story.
But one well-written letter did not agree. It said that because America did not use the minds of its women, it was not as strong as it could be.
The name at the end of the letter was E. Cochrane.
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At first the editor was against the idea. He tried to say 'no' to Elizabeth. But after he heard her ideas for stories, he said that he would give her a chance.
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Many people in New York City heard of the woman reporter from Pittsburgh, but only one person wanted to give her a job. Joseph Pulitzer was happy to put Nellie to work on his newspaper, the World.
To get her stories, Nellie sometimes pretended to be someone else. She lived with poor people, worked in factories, and even had herself put in jail. This is why readers could believe the things she said in her stories.
Although Nellie wrote many stories that helped people, she became best known for her trip around the world. She read Jules Verne's Around the World in Eighty Days, a make-believe story about a man's eighty- day trip around the world.
Going around the world in only eighty days sounded impossible, but Nellie thought that it could be done. Joseph Pulitzer agreed with her. He gave her money for the trip.
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