Nhanh vs ạaa !!!!!!!!!!!

`a)`

Giả sử `Z_B>Z_A`

`Z_A+Z_B=32`

`Z_B-Z_A=8`

`->Z_A=12(Mg);Z_B=20(Ca)`

\(Mg:1s^22s^22p^63s^2\)

\(Ca:1s^22s^22p^63s^23p^64s^2\)

Ion tạo thành: `Mg^{2+},Ca^{2+}`

`b)`

`n_{Mg}=x(mol);n_{Ca}=y(mol)`

`->24x+40y=6,4(1)`

`Mg+2HCl->MgCl_2+H_2`

`Ca+2HCl->CaCl_2+H_2`

`n_{H_2}=x+y={4,48}/{22,4}=0,2(2)`

`(1)(2)->x=y=0,1(mol)`

`\%m_{Mg}={0,1.24}/{6,4}.100\%=37,5\%`

`\%m_{Ca}=100-37,5=62,5\%`

`n_{HCl\ pu}=2n_{H_2}=0,4(mol)`

`n_{MgCl_2}=x=0,1(mol);n_{CaCl_2}=y=0,1(mol)`

`C_{M\ MgCl_2}=C_{M\ CaCl_2}={0,1}/{0,5}=0,2M`

`C_{M\ HCl\ du}={0,5.1-0,4}/{0,5}=0,2M`