При сгорании органического вещества массой 0,7г образовалось 2,2г СО2 и 0,9г воды. Относительная плотность по азоту равна 2,5.Найдите молекулярную формулу вещества и составьте всевозможные изомеры и 2 гомолога. 
Пожалуйста,полностью)Спасибоо заранеее

  Задание 1. Перепишите предложения, употребив существительные во множественном числе и сделав соответствующие изменения:

1. That was a long story.

2. The leaf of this tree is yellow.

3. Is this a man or a woman?

4. There is a child in the garden.

Задание 2. Перепишите предложения, употребив прилагательные в нужной степени сравнения. Переведите предложения.

1. Which is (large): the United States or Cana­da?

2. What is the name of the (big) port in the United States?

3. Moscow is the (large) city in Russia.

4. The London underground is the (old) in the world.

5. There is a (great) number of cars and buses in the streets of Moscow than in any other city of Russia.

6. St. Petersburg is one of the (beau­tiful) cities in the world.

Задание 3. Перепишите предложения, подчеркнув в них местоимения. Укажите разряд местоимений. Переведите предложения.

1. Who can better know my weakness than I?

2. He has never got anything interesting to say.

3. None of those dogs are ours.

4. The child fell and hurt himself badly.

Задание 4. Перепишите предложения, раскрыв скобки и употребив глаголы в соответствующей временной форме группы.

1. He (to spend) last summer in the country.

2. He (not to spend) last summer in the country.

3. He (to spend) last summer in the country?

4.  Where he (to spend) last summer?

5. She (to help) mother yesterday.

6. She (not to help) moth­er yesterday.

7. She (to help) mother yesterday?

8. How she (to help) mother yesterday?

9. Kate (to cook) dinner every day.

10. Kate (to cook) dinner tomorrow.

11. Kate (to cook) dinner now.

12. Kate (to cook) dinner yesterday.

Задание 5. Переведите следующие предложения на английский язык:

Задание 6.  Раскройте скобки, употребляя глаголы в одном из следующих времен: Present, Past, Future Simple; Present, Past Continuous.

1. Look at these children: they (to skate) very well.

2. You (to skate) last Sunday? — Yes, we (to skate) the whole day last Sunday. We (to skate) again next Sunday.

3. My brother can skate very well. He (to skate) every Sunday. 4. What you (to do) now? — I (to wash) the dishes.

5. What you (to do) at three o'clock yesterday? — I (to have) din­ner.

6. You (to have) dinner now?

7. Where your brother (to work)? — He (to work) at an institute.

8. Your grandmother (to sleep) when you (to come) home yesterday?

9. What your brother (to do) to­morrow?

10. I (not to go) to the shop yesterday. I (to go) to the shop tomorrow.

Задание 7. Прочитайте и письменно переведите текст:

Healthy Food

Задание 8. Прочитайте текст и соотнесите заголовки с параграфами

Задание 9. Ответьте, верны ли эти предложения.