1) W(S)=(Ar(S)*n(S))/M(Fe2(SO4)3)=(32*3)/400=0,24 (24%)
2) SO3+H2O=H2SO4
n(SO3)=8/80=0,1 моль
m(H2SO4)=0,1*98=9,8 г
3) m(CH4)=2*16=32г
m(O2)=5*32=160г
m(NaCl)=2*58,5=117г
m(H2)=4*2=8г
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Answers & Comments
1) W(S)=(Ar(S)*n(S))/M(Fe2(SO4)3)=(32*3)/400=0,24 (24%)
2) SO3+H2O=H2SO4
n(SO3)=8/80=0,1 моль
m(H2SO4)=0,1*98=9,8 г
3) m(CH4)=2*16=32г
m(O2)=5*32=160г
m(NaCl)=2*58,5=117г
m(H2)=4*2=8г