-
2) вычислите массу сгоревшего фосфора, если образовалось 55 г оксида фосфора (III)
3) вычислите объем сгоревшего водорода, если образовалось 44, 8 л воды.-
Предмет:
Химия -
Автор:
samuel5ag0 - 5 лет назад
-
Ответы 1
-
4P + 3O2 = 2P2O3Знайдемо кількість речовини оксиду:55 г : 110 г/моль = 0,5 мольЗнайдемо кількість речовини фосфору:0,5 моль * 4 = 2 мольМаса Фосфору = 2 моль * 31 г/моль = 62 г
-
Автор:
hartman - 5 лет назад
-
0
-
-
Добавить свой ответ
Еще вопросы
-
Составьте программу и зарисуйте блок-схему к ней. Если число, введенное с клавиатуры, четырехзначное и делится на 5, то вывести слово "удача".
-
Предмет:
Информатика -
Автор:
camacho - 5 лет назад
-
Ответов:
1 -
Смотреть
-
-
На координатном луче отмечена точка А (9,65). Точка Б расположена левее, а точка С - правее от точки А. АБ = 3,25 и АС = 4,35. Найдите координаты точек Б и С.
-
Предмет:
Математика -
Автор:
christensen - 5 лет назад
-
Ответов:
4 -
Смотреть
-
-
Revision of Tenses.
Task 1. Use Present Simple or Present Continuous giving the appropriate form of the verb in brackets:
1) Some people still think that the Sun (go) round the Earth.
2) On Sunday we (go) to see a new play in the theatre.
3) – What … Tom (do) now?
– He (play) tennis. He (play) tennis every weekend.
4) I (stay) with John for a few weeks until my flat is ready.
5) My friends always (stay) with Lucy when they go to Bristol.
6) We (leave) at 8 o’clock tomorrow.
7) The train to London (leave) at ten o’clock.
8) Alice (work) for an insurance company as an insurance agent.
9) Phil (work) in Japan at the moment.
Task 2. Use Past Simple or Present Perfect giving the appropriate form of the verb in brackets:
1) Who is she? I (never see) her before.
2) I (see) “Romeo and Juliette” when I was in London.
3) Laura (buy) a new dress last Monday, but she (not wear) it yet.
4) Robert (live) in Rome for the last three weeks. He (live) in Paris before he (go) to Italy.
5) – Didn’t it rain last July?
– Yes, it rained last July but it (not rain) this July.
6) Jane (work) in York since January. Last year she (work) in Manchester.
7) I’m sorry, I (not finish) yet.
8) My sister (finish) her lunch five minutes ago.
9) I (read) a book for an hour and then I (go) for a walk.
Task 3. Use Past Continuous where appropriate , if it is not suitable – use Past simple:
1) My parents (watch) television while I (write) some letters.
2) I (look) out of the window and (see) that we ((fly) over the mountains.
3) The students (talk) excitedly) when the teacher (come) in.
4) When I (walk) in they (talk) about the weather.
5) While Rossi (make) the tea Larry (clean) his car.
6) The pupils (sit) down, (take)out their pens and (start) writing.
7) As I (walk) down the road I (see) Michael.
Task 4. Use Present Perfect Simple or Continuous, or Past Simple or Continuous:
1) I (work) for the same company since I (leave) school.
2) Andy (wait) for Marry for more than an hour.
3) Sam (do) these exercises since 4 o’clock. He … already (do) five exercises.
4) I (clean) the car. Doesn’t it look nice?
5) It (snow) when I returned home. It (snow) all morning.
6) I am very tired. I (wash) clothes all day.
7) It (not rain) for a month now. The grass is very dry.
8) Ann (garden) all afternoon. She (plant) a lot of rose bushes.
-
Предмет:
Английский язык -
Автор:
karinalhwm - 5 лет назад
-
Ответов:
2 -
Смотреть
-
-
Какие есть соцсети? Помогите пожалуйста!
-
Предмет:
Окружающий мир -
Автор:
jimmy57 - 5 лет назад
-
Ответов:
2 -
Смотреть
-
Топ пользователей
-
Fedoseewa27
35934 -
Devilian
2792 -
Pikachu
2228 -
hobbesbowers
2116 -
kaylynnbarron676
1818 -
女fei
1240 -
yulia-kaplina
1158 -
Poinntt
946 -
Bars
930 -
Queenmagic18
770
How much to ban the user?
1 hour
1 day
100 years