Mr(BaCl2)= Ar (Ba) +2Ar (Cl) =207
Mr(K2Cr2O7)= 2Ar(K) +2Ar (Cr) +7Ar(O) =294
Mr(MnSO4)= Ar(Mn) +Ar(S) +4Ar(O) = 151
Mr( CsOH)= Ar(Cs) +Ar(O) +Ar(H) =150
