Предмет: Химия, автор: Alyonka1998Klonov

к 40г раствора ортофосфата натрия с массовой долей 8%прилили 20г раствора с массовой долей Na3PO4 5%.Какова массовая доля(%)Na3PO4 в полученном растворе?

Ответы

Автор ответа: AlLeonStar

дано
найти
решение :
m1=20*8/100=3.2
m2=20*5/100=1
w=m b-ba/m r-a
w=(3.2+1)/(20+40)=0,3968253968253968

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: ОБЖ, автор: lizadizayn

Привести 2 примера использования обычного оружия (Оружия массового поражение)
Дата и где использовали

6 лет назад

Предмет: Английский язык, автор: dianaramazanov97

Find the antonym of the following words written in capitals.
1. I’ll have to take the PUPILS into the hills.
A) teachers B) schoolchildren C) kids D) students E) boys

2. She is the WORST student in our group.
A) good B) bad C) badly D) best E) nice

3. Breakfast is the FIRST meal of the day.
A) important B) main C) last but one D) last E) next

4. He is an enemy, REMEMBER.
A) keep in mind B) remind C) recall D) forget E) believe

5. Her luggage was so HEAVY that she asked the young man to help
her.
A) easy B) large C) least D) light E) vast

6. Her English is POOR.
A) excellently B) unsatisfactory C) bad D) good E) not good

7. February is the SHORTEST month in the year.
A) largest B) farthest C) longest D) highest E) biggest

8. TAKING a piece of chalk the pupil on duty began writing on the
board.
A) giving B) sending C) bringing D) spending E) belonging

9. I liked the END of the story most of all.
A) beginning B) middle C) starting D) meaning E) part

10. Our farm is in the COUNTRY.
A) street B) valley C) forest D) town E) park

11. I WAS RIGHT last night, wasn’t I?
A) was over B) were ill C) correct D) was wrong E) was busy

12. I don’t REMEMBER where I left my umbrella.
A) know B) forget C) give D) notice E) support

13. What is it then, my SON?
A) girl B) boy C) daughter D) dear E) friend

14. Some of them BEGAN to talk to me.
A) started B) finished C) was over D) ended E) founded

15. The hall was FULL with spectators.
A) easy B) empty C) vacant D) ready E) late

16. There are many other BIG cities in Great Britain with more than a
million inhabitants.
A) large B) short C) small D) great E) low

17. I can’t understand why you are so BUSY at home.
A) engaged B) sleepy C) afraid D) free E) angry

18. I think your FAT cat is ill.
A) thin B) stout C) big D) thick E) small

19. The prince ran after her and saw the pretty shoe which the girl HAD
LOST.
A) had found B) had left C) had forgotten D) had forgiven E) didn’t find

20. It was MIDNIGHT and Cinderella ran away from the palace.
A) early in the morning B) late night C) midday D) early night E) night

21. They OFTEN stay at the college after classes.
A) always B) seldom C) usually D) ever E) early

22. Long ago the streets of this town were DIRTY.
A) clean B) narrow C) wide D) broad E) long

23. He STARTED painting at a very early age and became famous at 27.
A) began B) gave up C) get up D) continued E) went on

24. The travelers came to the hotel, LEFT their luggage there and went
for a walk in the town.
A) kept B) raised C) caught D) took E) picked out

25. He began TO EARN money very early.
A) to change B) to touch C) to spend D) to sweep E) to tear

Срочно помогите пожалуйста

6 лет назад

Предмет: Химия, автор: matveydubinin

виды химической связи составить схемы образования 1) оксид натрия 2) оксид кремния 3)хлорид лития 4)хлор (Cl2) 5) соляная кислота

6 лет назад

Предмет: Математика, автор: hggdhghgd

На оптовую базу поступило 8 т яблок. Фирма "Фрукты Овощи" приобрела 22% а магазин "У дяди Пети " - 12 % этих яблок. На сколько больше тонн яблок приобрела фирма , чем магазин ?

9 лет назад

Предмет: Литература, автор: Алена444

Ночевала тучка золотая чему учит произведение современного читателя?

9 лет назад