M(al2o3)=2M(al)+3M(o)=2*27+3*16=102 г/моль
n(al2o3)=m(al2o3)/M(al2o3)=35/102=0.343 моль
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M(al2o3)=2M(al)+3M(o)=2*27+3*16=102 г/моль
n(al2o3)=m(al2o3)/M(al2o3)=35/102=0.343 моль