Предмет: Химия, автор: vanokalinin08102006

Дам 100б, СРОЧНО!

1. Який об'єм повітря витратиться для спалювання 10 л циклогексану?

2. Речовина містить 12,9% Карбону, 1,08% Гідрогену, все інше Бром. Густина парів речовини за воднем 139,5. Виведіть формулу

Ответы

Автор ответа: dyexfnf
1

Ответ:

Объяснение:

Дано:

V(C6H12) = 10 л

Найти:V(повітр.)-?

Складемо РХР:

C6H12 + 9O2 → 6CO2 + 6H2O

V(6H12) : V(О2)= 1 : 9

V(O2) = 10 * 9 = 90 л

У повітрі 21% кисню, тому маємо:

V(повітря) = 90 * 100/21 = 428,6 л

2)

Дано:

w(C) = 12,9% або 0,129

w(H) = 1,08% або 0,0108

D(H2) = 139,5

Найти: СхНуBrz - ?

Знайдемо масову частку брому:

w(Br) = 100% - w(C) - w(H) = 100% - 12,9% - 1,08% = 86,02% або 0,8602

Знайдемо молекулярну масу сполуки:

М(СхНуBrz) = D(H2) * М(Н2) = 139,5 * 2 = 279 г/моль

Вичислимо кількість ручовин:

n(C) = w(C) * М(СхНуBrz)/ М(С) = 0,129 * 279/12 = 3 моль

n(Н) = w(Н) * М(СхНуBrz)/ М(Н) = 0,0108 * 279/1 = 3 моль

n(Br) = w(Br) * М(СхНуBrz)/ М(Br) = 0,8602 * 279/80 = 3 моль

n(C) : n(Н) : n(Br) = 3 : 3 : 3

Отже формула : С₃Н₃Br₃

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