Предмет: Химия, автор: anastasiiazhar

Здравствуйте, очень прошу помогите. Мне нужно решение к "Дано и ответу"Задача№1.Дано:mв=3,9грV(C02)=6,72лm(H2O)=2,7грвД воздух=26СхНуOz-?
Мне очень нужно решение, помогите пожалуйста. Буду очень благодарна ОТВЕТ должен получится " С6Н6"

Ответы

Автор ответа: тайная
0
в условии вероятно ошибка: D(возд) = 26,  а D(возд) = 2.6 . и если ответ представлен в виде С6Н6, то в дано следует писать: СхНу
Дано:
m (в-ва) = 3,9 г
V (CO2) = 6,72 л
m (H2O) = 22,5 г
D(возд) = 2.6
Найти: СхНу
Решение:
M(в-ва) = D(О2) ∙ M(О2)= 2,6 ∙29 = 75,4  
3,9 г               6,72 л          2,7 г        
CxHy + O2 = xCO2    +    y/2H2O     
75,4 г              х∙22,4 л      9 ∙ у

3,9 г   -----   6,72 г
75,4 г       ------ х∙22,4 л          
 
х = 75,4 г ∙ 6,72 г 3,9 г ∙ 22,4 л = 5,8 ≈ 6

3,9 г   -----   2,7 г
75,4 г       ------ 9 ∙ у г       
у  = 75,4 г ∙ 2,7 г 3,9 г ∙ 9 г = 5,8 ≈ 6
х: y = 6:6 =  CxHy  = C6H6
Ответ: C6H6 (бензол)
примерный вариант решения исходя из условия. 
Автор ответа: LubchikA
0
такм не может быть ответ С6Н6 ,по одной простой причине ,что молярная масса должна ровняться 78 , а не 754 ( как нам дано по условию)
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