Na2CO3+Ba(NO3)2->2NaNO3+BaCO3
0,1------------------------------------------0,1
Na2SO4+Ba(NO3)2->2NaNO3+BaSO4
0,17-----------------------------------0,17
BaCO3+2HCl->BaCl2+H2o+CO2
0,1--------------------------------------0,1
nCO2=2,24\22,4=0,1 mol
=>mBaCO3=0,1.197=19,7g
=>mNa2CO3=0,1.106=10,6g
=>mNa2SO4=24,5g=>nNa2SO4=0,17 mol
=>b=mBaSO4=0,17.233=39,61g
=>a=39,61+19,7=59,31g