Determine the mass of the salt formed during the absorption of the complete combustion product of 14 liters of hydrogen sulfide

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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