hoa hoc
hoa tan hoan toan 4 g hon hop gom 1 kim loai hoa tri 2 va 1 kim loai hoa tri 3 can dung het 170 ml dd HCl 2M a, tinh the tich khi H2 sinh ra o dktc b,co can dung dich thu duoc bao nhieu g muoi kho c,neu kim loai hoa tri 3 thi kim loai hoa tri 2 la nguyen to nao (biet so mol cua nhom gap 5 lan mol kim loai