SO3 + H2O == H2SO4
(98%*X )98/80 +70%*Y = 96%(X+Y)
120.05X + 70Y = 96X + 96Y
24.05X = 26Y
98%三氧化硫26克＋70%硫酸24.05克=等于50.05克96%的硫酸