Na2SO4 + Ba(NO3)2 = 2 Na(NO3)2 + BaSO4 (pp alb)
M Na2SO4 = 2*23+32+4*16 = 142
M BaSO4 = 137+32+4*16 = 233
142 g Na2SO4.........233 g BaSO4
x.................................186,4 g BaSO4
x = 113,6 g Na2SO4
m ZnCl2 = m amestec - m sulfat = 200 - 113,6 = 86,4 g ZnCl2
%ZnCl2 = m ZnCl2/m amestec * 100 = 86,4/200*100 = 43,2%
%Na2SO4 = m Na2SO4/m amestec * 100 = 113,6/200*100 = 56,8%