Fe+H2SO4=FeSO4+H2↑ Mg+H2SO4=MgSO4+H2↑
56 2 24 2
x a y a
∴x=28a,y=12a
∴m(Fe):m(Mg)=28a:12a=7:3
Zn+2HCl=ZnCl2+H2↑ Fe+2HCl=FeCl2+H2↑
65 2 56 2
b m b n
∴m=2b/65;n=2b/56
∴m(H2)1:m(H2)2=m:n=2b/65:2b/56=56:65
Fe+H2SO4=FeSO4+H2↑ Mg+H2SO4=MgSO4+H2↑
56 2 24 2
x a y a
∴x=28a,y=12a
∴m(Fe):m(Mg)=28a:12a=7:3
Zn+2HCl=ZnCl2+H2↑ Fe+2HCl=FeCl2+H2↑
65 2 56 2
b m b n
∴m=2b/65;n=2b/56
∴m(H2)1:m(H2)2=m:n=2b/65:2b/56=56:65