A 50 g solid mixture containing MgSO4 is dissolved in water and treated with an excess of Ba(NO3)2 resulting in the precipitation of 76.5 g of BaSO4. What is the percent of content of MgSO4 in the sample?
MgSO4 (aq) +Ba(NO3)2 (aq) ---->. BaSO4 (s) + Mg(NO3)2 (aq)