W(Fe)=x
w(Mg)=1-x
m=2 г
n(H₂)=0,05 моль
m(Fe)=xm
m(Mg)=(1-x)m
Fe + 2HCl = FeCl₂ + H₂
xm/M(Fe)=n'(H₂)
Mg + 2HCl = MgCl₂ + H₂
(1-x)m/M(Mg)=n''(H₂)
n'(H₂)+n''(H₂)=n(H₂)=xm/M(Fe)+(1-x)m/M(Mg)
0,05=2x/55,8+2(1-x)/24,3
x=0,695
w(Fe)=0,695
w(Mg)=1-0,695=0,305