Ответ:
Mr(Ca(MnO4)2) = Ar(Ca)+2*Ar(Mn)+8*Ar(O) = 40+110+128 = 278
Mr(Mg(H2PO4)2) = Ar(Mg)+4*Ar(H)+2*Ar(P)+8*Ar(O) = 23+4+62+128 = 217
Mr(Fe(OH)3) = Ar(Fe)+3*Ar(O)+3*Ar(H) = 56+48+3 = 107
Mr(Al2(SO4)3) = 2*Ar(Al)+3*Ar(S)+12*Ar(O) = 54+96+192 = 342
Mr(Cu(NO3)2) = Ar(Cu)+2*Ar(N)+6*Ar(O) = 64+28+96 = 188
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Ответ:
Mr(Ca(MnO4)2) = Ar(Ca)+2*Ar(Mn)+8*Ar(O) = 40+110+128 = 278
Mr(Mg(H2PO4)2) = Ar(Mg)+4*Ar(H)+2*Ar(P)+8*Ar(O) = 23+4+62+128 = 217
Mr(Fe(OH)3) = Ar(Fe)+3*Ar(O)+3*Ar(H) = 56+48+3 = 107
Mr(Al2(SO4)3) = 2*Ar(Al)+3*Ar(S)+12*Ar(O) = 54+96+192 = 342
Mr(Cu(NO3)2) = Ar(Cu)+2*Ar(N)+6*Ar(O) = 64+28+96 = 188