Предмет: Химия, автор: VERANIKA11

Задание№1
Рассчитайте относительную молекулярную массу серной кислоты H2SO4
Задание №2
Рассчитайте массовую долю (%) элементов входящих в состав гидроксида алюминия Al(OH)3.
Задание№3
Выведите простейшую формулу соли, если известны массовые доли элементов, входящих в ее состав: K - 39,69%, Mn - 27,87%, О - 32,46%
Пожалуйста !! Срочно нужно!!!

Ответы

Автор ответа: kattycats
11
1. M(H2SO4) = 2x1+1x32+4x16 = 98 г/моль
2. M(Al(OH)3) = 27+3x16+3x1 = 78 г/моль
W(Al) = (27/78)x100% = 34,62%
W(O) = (3x16/78)x100% = 61,54%
W(H) = (3x1/78)x100% = 3,85%
3. K : Mn : O = 39,69/A(K) : 27,87/A(Mn) : 32,46/A(O) = 39,69/39 : 27,87/55 : 32,46/16 = 1,018 : 0,507 : 2,029 = 2 : 1 : 4 следовательно, формула имеет вид K2MnO4
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3. I will have prepared all the documents by the beginning of the meeting tomorrow.
4. The film will have finished by 7 o’clock tomorrow.
5. They will have decorated the square by the beginning of the demonstration next week.
6. The President will have finished the press conference by 3 o’clock tomorrow.
7. Diana will have designed your wedding dress by next Friday.
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