Người ta cho 28g Fe vào dd HCl thấy còn dư axit, sau đó cho thêm vào 20,25g Al vào dung dịch. Tính thể tích khí H2 thu được sau thí nghiệm? Có tóm tắt nha mn

2 câu trả lời

Đáp án:

`∑V_{H_2}=36,4(lít)`

Giải thích các bước giải:

Ta có các `PTHH:`

`Fe + 2HCl->FeCl_2+H_2↑`   `(1)`

`2Al+6HCl ->2AlCl_3+3H_2↑`   `(2)`

Trong `(1)`

`n_{Fe}=n_{H_2}(1)=m/M=28/56=0,5(mol)`

`=>V_{H_2}(1)=n.22,4=0,5.22,4=11,2(lít)`

Trong `(2)`

`n_{Al}=m/M={20,25}/27=0,75(mol)`

`=>n_{H_2}(2)=3/2n_{Al}=3/2xx0,75=1,125(mol)`

`=>V_{H_2}(2)=1,125.22,4=25,2(lít)`

Vậy :

`∑V_{H_2}=V_{H_2}(1)+V_{H_2}(2)=11,2+25,2=36,4(lít)`

`#nam`

Đáp án:

 

Giải thích các bước giải:

 

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