Mr(SO3)=32+16•3=80
Mr(NO2)=14+16•2=46
Mr(C3H8)=12•3+1•8=44
Mr(C6H6)=12•6+1•6=78
Mr(C12H22O11)=12•12+1•22+16•11=342
Mr(C2H6O)=12•2+1•6+16=46
Mr(Cl2O7)=35,5•2+16•7=183
Mr(B2H6)=11•2+1•6=28
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Mr(SO3)=32+16•3=80
Mr(NO2)=14+16•2=46
Mr(C3H8)=12•3+1•8=44
Mr(C6H6)=12•6+1•6=78
Mr(C12H22O11)=12•12+1•22+16•11=342
Mr(C2H6O)=12•2+1•6+16=46
Mr(Cl2O7)=35,5•2+16•7=183
Mr(B2H6)=11•2+1•6=28
Удачи)