Предмет: Химия, автор: Indushkada

Даю 99Балов за роботу

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Ответы

Автор ответа: dyexfnf

1

Ответ:

Объяснение:

2KMnO4 = K2MnO4 + MnO2 +O2↑

Хімічна формула: KMnO4

Відносна формульна маса:

М(KMnO4) = Ar(K) + Ar(Mn) + Ar(O) * 4 = 39 + 55 + 16 * 4 = 158

Масова частка Оксигену:

w(O) = Ar(O) * n/М(KMnO4) * 100% = 16 * 4/158 * 100% = 40,5%

№2

Fe + 2 HCl → FeCl2 + H2

2 N2O5 → 4 NO2 + O2

2 Pb + O2 → 2 PbO

CaCO3 → CaO + CO2

2 KBr + Cl2 → 2 KCl + Br2

Fe(OH)3 + 3 HCl → FeCl3 + 3 H2O

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