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.
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
Дур*
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