giúp em bài 3b vs mọi người

TN1:

`2K+2H_2O->2KOH+H_2`

`2KOH+Zn->K_2ZnO_2+H_2`

Theo PT: `n_K+n_{KOH}=2n_{H_2}`

Mà `n_K=n_{KOH}`

`->n_K=n_{H_2}={11,2}/{22,4}=0,5(mol)`

TN2:

`2K+2H_2O->2KOH+H_2`

`2KOH+Zn->K_2ZnO_2+H_2`

Theo PT: `1/2n_K+n_{Zn}=n_{H_2}`

`->0,25+n_{Zn}={17,92}/{22,4}=0,8(mol)`

`->n_{Zn}=0,55(mol)`

`->m=0,55.65+0,5.39=55,25(g)`