Bài 2. CHo kim loại Al tác dụng với axit sunfuric (H2SO4) tạo thành muối Al2(SO4)3 và 11,2 lít khí H2 a. Viết PTHH b. Tính kl Al phản ứng c. Tính kl H2SO4 tạo thành d. Tính kl Al2(SO4)3

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`a.` `PTHH``:`

          `2Al``+``3H_2``SO_4``→``Al_2(SO_4)_3``+``3H_2`

`b.` $n_{H_2(đktc)}$`=``\frac{V}{22,4}``=``\frac{11,2}{22,4}``=``0,5` `(mol)`

`PTHH`          `2Al``+``3H_2``SO_4``→``Al_2(SO_4)_3``+``3H_2`

                        `0,33`          `0,5`                  `0,17`                 `0,5`     `mol`

`→``n_{Al}``=``n_{H_2}``=``\frac{0,5.2}{3}``≈``0,33` `(mol)`

`→``m_{Al}``=``n``.``M``=``0,33``.``27``≈``8,91` `(g)`

`c.`Theo pt, ta có: `n_{H_2SO_4}``=``n_{H_2}``=``0,5` `(mol)`

`→``m_{H_2SO_4}``=``n``.``M``=``0,5``.``98``=``49` `(g)`

`d.`Theo pt, ta có: `n_{Al_2(SO_4)_3}``=``n_{H_2}``=``\frac{0,5.1}{3}``≈``0,17` `(mol)`

`→``m_{Al_2(SO_4)_3}``=``n``.``M``=``0,17``.``342``≈``58,14` `(g)`

 

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