Предмет: Химия, автор: Аноним

ДАЮ 50 ПУНКТОВ ЗА ПРВИЛЬНОЕ РЕШЕНИЕ!

Нужно решить правильно задачу...

1)Найдите молекулярную формулу алкинов,

малккулярная масса водорода равна 11,1%
относительная плотность его по воздуху равна 1,863

Ответы

Автор ответа: AnnKalevich

Дано: Dв(СхНу) = 1,863

w(H) = 11,1 %

Найти: СхНу

Решение:

М(СхНу) = Dв(СхНу) * M(возд)

М(возд) = 29 г/моль

М(СхНу) = 1,863 * 29 = 54 г/моль

х : у = 88,9 : 11,1 = 7,4 : 11,1 = 1 : 1,5 = 2 : 3 => С2Н3 - нет такого алкина

12 1

(Общая формула алкинов СnH2n+2)

M(C2H3) = 12*2 + 1*3 = 27 г/моль, а М(СхНу) = 54 г/моль, следовательно получаем С4Н6 - бутин

Ответ: С4Н6 - бутин

Автор ответа: z1elena1z

С4Н6.............................................

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: История, автор: artyom129x

Установи достоверность утверждения. Абылай-хан в качестве казахского хана заключил соглашения о мире с Россией и Китаем. Эти договоры проводились по международным европейским канонам, без аманатов и даров.

6 лет назад

Предмет: Алгебра, автор: leonaldik48

Дана функция у=х:
а) График которого проходит через точку с координатами А(а;83). Найдите значение а.
b) Если хϵ[0;36], то какие значения будет принимать данная функция?
с) yϵ[14;28]. Найдите значение аргумента.
d) Найдите при каких х выполняется неравенство у≤5. Помогите пожалуйста

6 лет назад

Предмет: Английский язык, автор: kez071204

READING

Task. Read the text.

TAKE ME OUT TO THE BALLPARK

A. Baseball is a much-loved national sport in the USA. It is also popular in the countries of South America and Japan. Europe is another matter. Not many baseball teams exist in Europe today. It is slowly changing. Since baseball is an Olympic sport, lots of countries are joining the game!

B. Going to baseball games is a way of life for many fans. They sit in the stands on hot and sunny springs and summer days, eat hot dogs or popcorn, sip cola or lemonade, and enjoy the game. Adults and children like to attend games, and it’s a sport that everyone seems to love. Baseball is such a part of American life and nearly everyone’s favourite childhood memory includes a day at the ballpark.

C. Modern baseball began about 150 years ago in New York, USA and has been popular sport ever since. It has changed a little bit over the years but the basic game remains the same. Baseball is played with a bat, which is a stick of about 100 cm long, made of metal or wood, and a small hard ball. Each player wears one heavy leather glove to catch the ball. Baseball is played on a special outdoor field.

D. The game of baseball is divided into 9 parts, called innings. During an inning each of the two teams takes its turn to bat, which means trying to hit the ball that is thrown to them by the pitcher of other team. After the ball is hit, the player tries to run and touch three different bases before running to the home base. The team that is not batting tries to catch the balls that are hit, and stop the runners before the score. The team that scores the most runs by the end of the ninth inning wins.

Task 1. Match the headings 1-5 to the paragraphs A-D. ONE IS EXTRA

1. The rules of playing the games -------------

2. The facilities -------------

3. The changes happening to baseball -------------

4. Part of people’s life -------------

5. Adults and children watch this sport on TV ------------- [4]

Task 2. Mark an extra heading ------------- [1]

Task 3. Mark TRUE or FALSE sentences

1. There are eight periods in baseball. ----- [1]

2. Baseball has changed a lot in rules. ----- [1]

3. A pitcher throws the ball. ----- [1]

4. There are a lot of baseball teams, especially in Europe. ----- [1]

5. The history of the game counts more than a hundred years. ----- [1]

6 лет назад

Предмет: Обществознание, автор: loveli45

какое чувство труднее всего вырозить без слов

9 лет назад

Предмет: Алгебра, автор: мурзик1980

решить уравнение 4х-(9х-6)=46

9 лет назад