Carbon dioxide formed during the combustion of 8.4 liters of ethylene is absorbed by 472 ml of 6%

Carbon dioxide formed during the combustion of 8.4 liters of ethylene is absorbed by 472 ml of 6% sodium hydroxide solution (density equal to 1.06 g / ml). What is the composition of the resulting salt?

Given:
V (C2H4) = 8.4 L
V solution (NaOH) = 472 ml
ω (NaOH) = 6%
ρ solution (NaOH) = 1.06 g / ml

Find:
salt – ?

Solution:
1) C2H4 + 3O2 => 2CO2 ↑ + 2H2O;
2) n (C2H4) = V (C2H4) / Vm = 8.4 / 22.4 = 0.375 mol;
3) n (CO2) = n (C2H4) * 2 = 0.375 * 2 = 0.75 mol;
4) m solution (NaOH) = ρ solution (NaOH) * V solution (NaOH) = 1.06 * 472 = 500.32 g;
5) m (NaOH) = ω (NaOH) * m solution (NaOH) / 100% = 6% * 500.32 / 100% = 30.019 g;
6) n (NaOH) = m (NaOH) / M (NaOH) = 30.019 / 40 = 0.75 mol;
7) CO2 + NaOH => NaHCO3.

Answer: NaHCO3 is formed.