... A Mg B Ca C Zn D Ba Cỏch : Lp phng trỡnh tỡm nguyờn t ca M (Gi s ban u cú mol M) dựng chc nng Solve (gi X l kim loi cn tỡm(thay cho M) v gi s s mol ban u ca X l mol) (X + 71) ì100 = 17.15 X ... 35,5; Ba = 137) A 1,0M B 0,9M C 0,5M D 0,8M 0.1ì (137+71)= KQ=20.8>20,43 d Ba(OH)2 dựng chc nng Solve (gi X l nng mol ca dung dch HCl) 0.2 ì X ữ ì (137 + 34) + (0.1 0.2 ì X ữ 2) ì (137 + 34) ... Ba = 137) A 1,30M B 1,20M C 0,95M D 0,86M 0.1ì (137+71)=20.88 KQ=20.88...