Дано
m(C3H5(OH)3) = 13 g
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V(H2)-?
2C3H5(OH)3+6K-->2C3H5(OK)3+3H2
M(C3H5(OH)3) = 92 g/mol
n(C3H5(OH)3) = m/M = 13/92 = 0.14 mol
2n(C3H5(OH)3) =3n(H2)
n(H2) = 3*0.14 / 2 = 0.21 mol
V(H2) = n*Vm = 0.21 * 22.4 = 4.704 L
ответ 4.704 л