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Pada reaksi pembentukan karat, 4Fe+3O2→2FeO3 22,4 gram besi drealcer clan dengan 10 gram gas olcsigen (O2) meng hasilkan besi (III) oksida (Fe2O3). ternyata serclah reaksi ditemukan ada 0,4 gram gas oksigen (O2) yang tidak bereaksi. tentukan massa Fe2O3 yang terbentuk

Pada reaksi pembentukan karat,
4Fe+3O2→2FeO3
22,4 gram besi drealcer clan dengan 10 gram gas olcsigen (O2) meng hasilkan besi (III) oksida (Fe2O3). ternyata serclah reaksi ditemukan ada 0,4 gram gas oksigen (O2) yang tidak bereaksi. tentukan massa Fe2O3 yang terbentuk

Jawaban: m Fe2O3 = 32 g

Pembahasan:

Hukum kekekalan massa atau hukum Lavoisier menyatakan bahwa massa zat sebelum reaksi dan massa zat sesudah reaksi dalam suatu sistem tertutup memiliki jumlah yang tetap. Massa zat sebelum reaksi adalah:
m = m Fe + m O2
m = 22,4 g + 10 g = 32,4 g
Reaksi yang terjadi adalah:
4Fe + 3O2 → 2Fe2O3
Massa setelah reaksi adalah:
m = m Fe2O3 + m sisa O2
32,4 g = m Fe2O3 + 0,4 g
m Fe2O3 = 32 g

Jadi, massa Fe2O3 adalah 32 g.

 

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