дано
m(Mg) = 13 g
m(HCL) = 25 g
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V(H2)-?
M(Mg) = 24 g/mol
n(Mg) = m/M = 13 / 24 = 0.54 mol
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 25 / 36.5 = 0.68 mol
n(Mg) < n(HCL)
Mg+2HCL-->MgCL2+H2
n(Mg) = n(H2) = 0.54 mol
V(H2) = n*Vm = 0.54 * 22.4 = 12.096 L
ответ 12.096 л