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Газ, образовавшийся при нагревании Fe с избытком H2SO4 (конц.), пропустили через 14,79 см3 раствора K2SO3 (ω = 0,178, ρ = 1,08 г/см3).

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Ответ:
Py4KaJKJLACC
Py4KaJKJLACC
24.03.2021
2Fe + 6H2SO4 = Fe2(SO4)3 + 3SO2↑ + 3H2O
SO2 + K2SO3 + H2O = 2KHSO3
n(KHSO3) = 2n(K2SO3, прореаг.) = n(K2SO3) – n(K2SO3, прореаг.) = n(K2SO3, 2)
n(SO2) = n(K2SO3, прореаг.) = n(K2SO3)/3 = 14,79*1,08*0,178/(3*158) = 0,006 моль
n(Fe) = 2n(SO2)/3 = 0,004 моль
m(Fe) = 0,004*56 = 0,224 г
n(K2SO3) = 0,006*3 = 0,018 моль
n(KHSO3) = n(K2SO3, 2) = 0,012 моль
m(K2SO3) = 0,012*158 = 1,896 г
m(KHSO3) = 0,012*120 = 1,44 г
m(кон. р-ра) = 14,79*1,08 + 64*0,006 = 16,3572 г
ω(K2SO3) = (1,896/16,3572)*100% = 11,6%
ω(KHSO3) = (1,44/16,3572)*100% = 8,81%
Ответ: m(Fe) = 0,224 г, ω(K2SO3) = 11,6%, ω(KHSO3) = 8,81%
4,4(47 оценок)
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Ответ:
79272197114
79272197114
24.03.2021
My name is Vika. I`m 12 and I`m in the 5th form. I live in Bataysk. Last year I and my family were in the Zoo. We went to Rostov. I remember the day was sunny and very hot. The Zoo was big and beautiful. There were many cages with animals. The animals were so poor because hot. A poor brown bear lied in the bath in his cage! And only monkeys were happy. They jumped and ate bananas. I saw many animals in there. They were: a lion, a brown bear, a fox, a goat, a wolf, the monkeys, the parrots, the penguins, a deer and a giraffe. They were so funny and beautiful. But as for me the giraffes were the best in the Zoo. They were high and had unusual and beautiful eyes! That day was my favorite summer day! I thanked my parents that we were there.
4,7(14 оценок)
Ответ:
elenaelena6
elenaelena6
24.03.2021
My name is Vika. I`m 12 and I`m in the 5th form. I live in Bataysk. Last year I and my family were in the Zoo. We went to Rostov. I remember the day was sunny and very hot. The Zoo was big and beautiful. There were many cages with animals. The animals were so poor because hot. A poor brown bear lied in the bath in his cage! And only monkeys were happy. They jumped and ate bananas. I saw many animals in there. They were: a lion, a brown bear, a fox, a goat, a wolf, the monkeys, the parrots, the penguins, a deer and a giraffe. They were so funny and beautiful. But as for me the giraffes were the best in the Zoo. They were high and had unusual and beautiful eyes! That day was my favorite summer day! I thanked my parents that we were there.
4,4(20 оценок)
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