PTHH: \(SO_3+H_2O\rightarrow H_2SO_4\)
Ta có: \(n_{SO_3}=\dfrac{200}{80}=2,5\left(mol\right)=n_{H_2SO_4}\)
Mặt khác: \(m_{ddH_2SO_4}=1000\cdot1,12=1120\left(g\right)\) \(\Rightarrow m_{H_2SO_4\left(ban.đầu\right)}=1120\cdot17\%=190,4\left(g\right)\)
Bảo toàn khối lượng: \(m_{ddH_2SO_4\left(sau\right)}=m_{SO_3}+m_{ddH_2SO_4\left(ban.đầu\right)}=1320\left(g\right)\)
\(\Rightarrow C\%=\dfrac{2,5\cdot98+190,4}{1320}\cdot100\%\approx32,98\%\)