Предмет: Химия, автор: allouser181019

Визначити об’єм водню, який утворюється при повному розчиненні металічного алюмінію масою 40,5 г в хлоридній кислоті.

Ответы

Автор ответа: dyexfnf

Ответ:

Объяснение:

40,5 г х л

2Al + 6HCl → 2AlCl3 + 3H2

n =2 моль n= 3 моль

M = 27 г/моль Vm = 22,4 л/моль

m = 54 г V = 67,2 л

V(H2) = 40,5 * 67,2 : 54 = 16,8 л

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: История, автор: filimonova1211

«Виникнення Русі-України» 1) намалюйте шкалу часу, та позначте події: а) дати правління всіх князів від Аскольда до Святослава. б) згадування терміну «Україна»

11 месяцев назад

Предмет: Экономика, автор: Аноним

6 класс по технологии конспект на тему уход за домашними животными. забота о перелётных птицах

11 месяцев назад

Предмет: Английский язык, автор: bakumenkomax0

9. In pairs, complete the sentences in the quiz with one word in each gap.

11 месяцев назад

Предмет: История, автор: 212121212121210

Путь шел из Причерноморья до Дона,
оттуда – на земли ________________, в
Приуралье, а затем дальше к Иртышу и на
Алтай. Определите название племен,
пропущенного в отрывки из труда Геродота:A) тиграхаудов
B) парадарайев
C) сарматов
D) гуннов
E) уйсунов

6 лет назад

Предмет: Английский язык, автор: CONDICK

Choose the correct options.
1. We stay / are staying / will stay with our grandparents over the summer; we’ve already got the tickets.
2. I am going / will go / go to the doctor’s tomorrow morning. I’ve got an appointment.
3. We decided go / to go / going to the Caribbean this year.
4 I don’t have to work tomorrow, so I am going to spend / am spending the whole morning in bed!
5 I can’t talk now – I am going to phone / will phone you back.

IІ. Choose the best alternative to fill in the blanks:
1. It is evident that she ____a lot of care after that terrible accident.
a) needs b) will need c) is needing d) need
2. How long _____ here?
a) you live b) do you live c) have you lived
3. It _______ . The garden’s all white.
a) snows b) has been snowing c) was snowing
4. Mary is a good girl. She ______ her mother with the housework.
a) has always helped b) is always helping c) always helps
5. The goods will be with you soon. They’ve ____ left our warehouse.
a) since b) already c) yet
6. I felt very tired when I got home, so I _______ straight to bed.
a) had gone b) went c) has gone
7, I remember you. You ____ to go to school here.
a) use b) were used c) used
8. Samantha _____ in Mexico since 2005.
a) is living b) has lived c) have lived
9. It ____ all day, so we haven’t left the house.
a) has been raining b) is raining c) rained
10. I’ve decided what to spend my redundancy money on. I ______ my own business.
a) am going to start b) start c) would start
11. Did you phone the doctor? – Yes, I ____him on Friday. .
a) ‘ll see b) ‘m seeing c) ‘m going to see
12. I thought about your proposal, and I think we _____ it.
a) accept b) will have accepted c) will accept
13. The train ____ in Kyiv at 7.30 a.m.
a) arrives b) arrive c) arrived d) has arrived
14. My coffee ____ bitter. Pass me the sugar, please.
a) is tasting b) tastes c) has tasted d) taste
15. I ____ about this project since last spring.
a) think b) thought c) have been thinking
16. I ____ in Doha on August 14th 2015.
a) had arrived b) have arrived c) arrived d) was arriving
17. I ____ some evening classes this semester, and I have a lot of homework.
a) am taking b) take c) was taking
18. Last night, I fell asleep while I ____ TV
a) watched b) was watching c) had watched d) had been watching
19. How long ____ when the bus finally came?
a) have you been waiting c) had you been waiting
b) are you waiting d) you had been waiting
20. Lots of things have happened since I ____ to you
a) had last wrote b) was last writing c) had last written d) last wrote
21. They ______ Paris twice this month.
a) have been to b) have been in c) have gone to
22. I haven’t had a chance to speak to her _____, but I’m sure she’ll agree.
a) yet b) already c) never
23. ______ on the same flight as your boss next week?
a) Are you flying b) Do you fly c) Will you fly
24. I think I _______ your offer overnight if that’s OK.
a) consider b) ’ll consider c) ’m going to consider

ІІІ. Complete the sentences with the correct future form of the verb in brackets.
1 I (cook) a big meal for everyone tonight. Would you like to come?
2 Are you cold? I (close) the window if you want.
3 My dad (fly) to Japan at 4 p.m. tomorrow.
4 I’ve got a busy day tomorrow, so I (finish) my Maths homework tonight.
5 There’s no bread! I (go) and buy some.
6 Bye then, Harry! I ______ (see) you tomorrow

6 лет назад