1. А) Mr(Fe(OH)=Ar(Fe)+Ar(O)+Ar(H)=56+16+1=73
Б) Mr(Fe(BO)=Ar(Fe)+Ar(B)•2+Ar(O)•2=56+22+2=80
3. 2Na+O2=2NaO
4Fe+5O2=2Fe2O5
4N(|||)+3O2=2N2O3
6PbS+3O2=3PbO2+2S3O
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Answers & Comments
1. А) Mr(Fe(OH)=Ar(Fe)+Ar(O)+Ar(H)=56+16+1=73
Б) Mr(Fe(BO)=Ar(Fe)+Ar(B)•2+Ar(O)•2=56+22+2=80
3. 2Na+O2=2NaO
4Fe+5O2=2Fe2O5
4N(|||)+3O2=2N2O3
6PbS+3O2=3PbO2+2S3O