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Hope21
Hope21
17.04.2023 02:14 •  Химия

Записать наблюдения 1. написать уравнение реакции в молекулярной и структурной формах: получения ацетилена из карбида кальция и воды, присоединения брома к ацетилену (в две стадии); 2. написать уравнение реакции полного сгорания ацетилена; 3. объяснить, почему ацетилен обесцвечивает бромную воду и раствор перманганата калия.

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Ответ:
89109301839
89109301839
19.08.2022 00:56

12 г Mg-8г, 39 г К-8г,  9г Al-14,4г

Объяснение:

12г магния:

2Mg+O2=2MgO

M(Mg)=24 г/моль

U(Mg)=m/M=0,5 моль

из уравнения U(O2)=1/2U(Mg)=0,25 моль

M(O2)=16*2=32 г/моль

m(O2)=M*U=8 г

39г калия:

39 г        x г

4K    +   O2  = 2K2O

156  г     32 г

39 г --- x г

156 г --- 32 г

х = 39 г ∙ 32 г\156 г = 8 г

ответ: m(O2) = 8 г

9г Аl:

2Al  +3 O2=  2Al2O3

1/ Находим  количество  алюминия. n=9/27 =0,3 (моль)

2. По уравнению реакции определяем количество кислорода. 0,3/2=n/3, отсюда  n = 0,3*3/2=0,45( моль )

3. Определяем массу кислорода.  m =0,45*32=14,4(г)

ответ : 14,4 г  

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Ответ:
Maksim777900
Maksim777900
16.01.2022 06:50

Дур*

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