Объяснение:
Mr(Al2O3)=27*2+16*3=102
Mr(Ba(OH)2=137+16*2+1*2=171
Mr(Cu2O)=64*2+16=144
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Объяснение:
Mr(Al2O3)=27*2+16*3=102
Mr(Ba(OH)2=137+16*2+1*2=171
Mr(Cu2O)=64*2+16=144