Предмет: Химия, автор: zhenja85

Який об'єм вуглекислого газу, утвориться при спалюванні суміші, що містить 5г етанолу, та 15г гліцеролу. СРОЧНО ПОЖАЛУЙСТА ДАНО И РЕШЕНИЕ​

Ответы

Автор ответа: dyexfnf
1

Ответ:

Объяснение:

Дано:

m(C2H6O) = 5г

m(C3H8O3 ) = 15г

Найти: V(CO2) - ?

М(C2H6O) = 12 * 2 + 1 * 6 + 16 = 46 г/моль

М(C3H8O3) = 12 * 3 + 1 * 8 + 16 = 60 г/моль

Знайдемо кількість речовини етанолу, та гліцеролу:

n(C2H6O) = m(C2H6O)/М(C2H6O) = 5/46 = 0,108 моль

n(C3H8O3) = m(C3H8O3)/М(C3H8O3) = 15/60 = 0,25 моль

Обчислимо об'єм етанолу, та гліцеролу в суміші;

V(C2H6O) = n(C2H6O) * Vm= 0,108 * 22,4 = 2,42 л

V(C3H8O3) = n(C3H8O3) * Vm = 0,25 * 22,4 = 5,6 л

Складемо РХР горіння етанолу:

C2H6O + 3O2 → 2CO2 + 3H2O

З РХР бачимо,що  V(СO2) = 2V(C2H6O) = 2 * 2,42 = 4,84 л

Складемо РХР горіння гліцеролу:

2C3H8O3 + 7O2 → 6CO2 + 8H2O

З РХР бачимо,що  V(СO2) = 3V(C3H8O3) = 3 * 5,6 = 16,8 л

Загальний об'єм вуглекислого газу:

ΣV(СO2) = 4,84  + 16,8 = 21,64  л

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