Giúp mk vs ạ Dùng 150 g quặng pirit chứa 20% chất trơ điều chế H2SO4. Đem toàn bộ lượng axit điều chế được hòa tan vừa đủ m g Fe203. Tất cả p/ư xảy ra hoàn toàn hãy: a. Tính khối lượng H2SO4 điều chế được? b. Tính m ?

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Đáp án:

vì trong quặng pirit chứa 20% chất trơ nên FeS2 chiếm 80% trong quặng pirit nên ta có:

m FeS2 = 

PTHH

4FeS2 + 11O2 -to-> 2Fe2O3 + 8SO2

2SO2 + O2 -to- V2O5 -> 2SO3

SO3 + H2O -> H2SO4

Từ ba phương trình hóa học trên ta có chuỗi phản ứng:

FeS2 -> 2 SO2 -> 2 SO2 -> 2 H2SO4

1mol ->2 mol ->2 mol ->2mol

120g------------------------>196g

120g------------------------->196g

vậy điều chế được 196 g H2SO4

n H2SO4 = 

Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O

1 mol---3mol---------1mol-----------3mol

2/3 mol <-2mol

mFe2O3 = n*M = 

Giải thích các bước giải:

 

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