M(PbO2)=207+16×2=207+32=239
M(CO2)=12+16×2=12+32=44
M(CO)=12+16=28
M(H2O)=1×2+16=2+16=18
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M(PbO2)=207+16×2=207+32=239
M(CO2)=12+16×2=12+32=44
M(CO)=12+16=28
M(H2O)=1×2+16=2+16=18