Объяснение:

Mr(Fe2O3)=(56×2)+(16×3)=160

Mr(CuSO4)=64+32+(16×4)=160

Mr(NaOH)=23+16+1=40

10. Mr(CO2)=12+(16×2)=44

w(C)=12/44×100%=27,27

w(O2)=32/44×100%=72,72%

H2S

Mr(H2S)=(1×2)+32=34

w(H2)=2/34×100%=5,8%

w(S)=32/34×100%=94,1%

Mr(H2SO4)=98

w(H2)=2/98×100=2,04%

w(S)=32/98×100%=32,65

w(O4)=64/98×100%=65,3%