дано
m(Fe) = 5.6 g
m(HCL) =5 g
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V(H2)-?
M(Fe) =56 g/mol
n(Fe)= m/M = 5.6 / 56 = 0.1 mol
M(HCL) = 36/5 g/mol
n(HCL) = m/M = 5/ 36.5= 0.14 mol
n(Fe) < n(HCL)
Fe+2HCL-->FeCL2+H2
n(Fe) = n(H2) = 0.1 mol
V(H2) = n*Vm = 0.1*22.4 = 2.24 L
ответ 2.24 л