дано
m(H2O2) = 13.6 g
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m(O2)-?
V(O2)-?
H2O2-->H2+O2
M(H2O2) = 34 g/mol
n(H2O2) = m/M = 13.6 / 34 = 0.4 mol
n(H2O2) = n(O2) = 0.4 mol
M(O2) = 32 g/mol
m(O2) = n*M = 0.4*32= 12.8 g
V(O2) = Vm*m(O2) / M(O2) = 22.4*12.8 / 32 = 8.96 L
ответ 12.8 г, 8.96 л