%mFe=\(\dfrac{7}{19}.100=36,84\%\)
%mS=\(\dfrac{4}{19}.100=21,05\%\)
%mO=42,11%
->CTHH :FexSyOz
x:y:z=\(\dfrac{7}{56}:\dfrac{4}{32}:\dfrac{8}{16}=1:1:4\)
=>CTHH :FeSO4
a) %mFe = \(\dfrac{7}{7+4+8}.100%\) %= 36,84%
%mS = \(\dfrac{7}{7+4+8}.100\)% = 21,05%
%mO = 100% - 36,84% - 21,05% = 42,11%
b) CTHH : FexSyOz
x : y : z = \(\dfrac{36,84}{56}:\dfrac{21,05}{35}:\dfrac{42,11}{16}=1:1:4\)
CTHH:FeSO4