Determine the mass of the salt formed during the absorption of the complete combustion product of 14 liters of hydrogen sulfide with a solution containing 5 g of sodium hydroxide.
2H2S + 3O2 → 2SO2 + 2H2O
SO2 + 2NaOH → Na2SO3 + H2O
n (H2S) = 14 / 22.4 = 0.625 mol
n (SO2) = n (H2S) = 0.625 mol – in excess
n (NaOH) = 5/40 = 0.125 mol – deficient
⇒ n (Na2SO3 = n (NaOH): 2 = 0.125: 2 = 0.0625 mol
m (Na2SO3) = 0.0625 x (46 + 32 + 48) = 7.875 g
Answer: the mass of the resulting salt is 7.875 g.
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