8. H2O; B2O3; SiO2; Cl2O5;
9. Mr(CaCO3)=40+12+16×3=100
w(O3)=48:100=0,48=40%
10.2Sr+O2-->2SrO
CH4+O2-->CO2+2H2O
4N2+5O2-->2N2O5
Ca3P2+6HCl-->3CaCl2+2PH3
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8. H2O; B2O3; SiO2; Cl2O5;
9. Mr(CaCO3)=40+12+16×3=100
w(O3)=48:100=0,48=40%
10.2Sr+O2-->2SrO
CH4+O2-->CO2+2H2O
4N2+5O2-->2N2O5
Ca3P2+6HCl-->3CaCl2+2PH3