mdung dịch H2SO4 = 500.1,2 \(=600\left(g\right)\)
=> mH2SO4 = 600.24,5% \(=147\left(g\right)\)
PTHH : SO3 + H2O -> H2SO4
nSO3 = \(\dfrac{m}{80}\left(mol\right)\)
Theo PTHH => nH2SO4 = m/80 (mol) => mH2SO4 = 1,225m(g)
=> \(\Sigma m_{H2SO4}=1,225m+\)147 (g)
mdung dịch = m + 600 (g)
Theo bài ra ta có hệ :
\(\dfrac{1,225m+147}{m+600}.100\%=49\%\)
=> m=392 (g)