1)Дано
m(Pb)=72.45 ;
m(PbO)-?
2Pb+O2=2PbO
n(Pb)=m/M
n(Pb)==72.45/207=0.35 моль
m(PbO)=n×Mr=0.35×223=78.05 г
2)Дано
N(HF)=2.4088×10^23
m(HF)-?
V(HF)-?
m((HF)=(Mr×N)/N(A)
m(HF)=(20×2.4088×10^23)/6.02×10^23=6.71 г
V(HF)=(Vm×N)/N(A)=(22.4×2.4088)/6.02×10^23=8.96 л
1)Дано
m(Pb)=72.45 ;
m(PbO)-?
2Pb+O2=2PbO
n(Pb)=m/M
n(Pb)==72.45/207=0.35 моль
m(PbO)=n×Mr=0.35×223=78.05 г
2)Дано
N(HF)=2.4088×10^23
m(HF)-?
V(HF)-?
m((HF)=(Mr×N)/N(A)
m(HF)=(20×2.4088×10^23)/6.02×10^23=6.71 г
V(HF)=(Vm×N)/N(A)=(22.4×2.4088)/6.02×10^23=8.96 л