дано
m(H2S) = 32 g
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V(возд)-?
2H2S+3O2-->2H2O+2SO2
M(H2S) = 34 g/mol
n(H2S) = m/M =32 / 34 = 0.94 g/mol
2n(H2S) = 3n(O2)
n(O2) = 3*0.94 / 2 = 1.41 mol
V(O2) = n(O2) * Vm = 1.41*22.4 = 31.584 L
V(возд) = 31.584 * 100% / 21% = 150.4 L
ответ 150.4 л