Sửa đề: "3,36 lít CO2"
Ta có: \(\left\{{}\begin{matrix}n_{NaOH}=\dfrac{18}{40}=0,45\left(mol\right)\\n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa
PTHH: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Bazơ dư nên tính theo CO2
Theo PTHH: \(n_{Na_2CO_3}=0,15\left(mol\right)=n_{NaOH\left(dư\right)}\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3}=0,15\cdot106=15,9\left(g\right)\\m_{NaOH}=0,15\cdot40=6\left(g\right)\end{matrix}\right.\)