Предмет: Химия, автор: artemhohlov018

срочно
Приготовьте 80 г водного раствора с массовой долей

соды (натрий карбоната) 15 %.

Ответы

Автор ответа: ivanovfilipp1
1

Ответ:

12 грамм карбоната натрия и 68 грамм воды

Объяснение:

1) 80 * 15% = 12 грамм карбоната натрия потребуется

2) 80 - 12 = 68 грамм воды

Ответ: 12 грамм карбоната натрия и 68 грамм воды

Вроде всё так

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Natasha works at the Ministry of Trade. She is a secretary of Rossvneshtrans. Their firm
does business with many countries: England, France, Spain, Italy and others. She
usually comes to her office at 9 o'clock. She types many letters, offers and other
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Now Natasha is at her office. She is speaking on the phone with Mr. Bill, a representative
of Bell&Co. She is writing down some details for the company manager. The manager is
preparing for the talks. He has an appointment for Monday. Bell&Co are interested in a new model of trains. The manager and his secretary are preparing different catalogues and quotations for the talks. Natasha likes her job very much.

1) Where does Natasha work?
2) When does she come to the office?
3) Who meets customers?
4) What do parties discuss at the talks?
5) When does the secretary go to University?
6) Why does Natasha study languages?
7) What is the secretary doing now?
8) What is the manager doing at the moment?
9) What models of equipment are Bell & Co interested in?