nK2SO3.6H2O = 39.9/(158+6*18) = 266=0.15 mol
=> nK2SO3 = 0.15 mol
mH2SO4 = 140*14/100=19.6 g
nH2SO4 = 0.2 mol
K2SO3 + H2SO4 --> K2SO4 + SO2 + H2O
Bđ: 0.15_____0.2
Pư: 0.15_____0.15______________0.15
Kt: 0________0.05______________0.15
Dd sau phản ứng : 0.05 (mol) H2SO4, 0.15 (mol) K2SO4
mH2SO4(dư) = 4.9g
mK2SO4 = 26.1 g
mdd sau phản ứng = mK2SO3.6H2O + mddH2SO4 - mSO2 = 39.9 + 140 - 0.15*64=170.3g
C%H2SO4 dư = 2.87%
C%K2SO4 = 15.32%