Na2SO4+BaCl2==BaSO4↓+2NaCl 208 233 117 x 23.3g y208/x=233/23.3g=117/yx=20.8gy=11.7g(1) 20.8g/208g*100%=10%(2) 21.3g/(35.5/58.5)-11.7g=23.4g
