Предмет: Химия, автор: Metallica986

Дорогие, помогите, пожалуйста!
1. Почему спирты с длинной углеродной цепью практически не растворяются в воде?
2. Найти молекулярную формулу вещества, содержащего 81,8% углерода и 18,2% водорода. Относительная плотность вещества по азоту равна 1,57. Дай название веществу и составь его структурную формулу.

Не сдам до завтра - убьют :D заранее спасибо

Ответы

Автор ответа: Аноним

2) 1)81,8/12=6,8167

2)18,2/1=18,2

3)1,57*28=43,96

4)Т.Е. С3Н8

либо этот вариант.

Приложения:

Автор ответа: gusmakvlad

1) Растворимость спиртов объясняется образованием водородных связей между молекулами спирта и воды. По мере удлинения углеводородной цепи относительное влияние водородных связей уменьшается и спирты с длинной углеродной цепью практически не растворяются в воде.
2)Mr(CxHy)=1.57*28=44
m(C)=44*0.818=36 г
n(C)=36/12=3 атома
m(H)=44*0.182=8 г
n(H)=8/1=8 атомов
C3H8- пропан CH3-CH2-CH3

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