Twenty iron tablets for dietary use, totaling 22.131 grams, were finely ground and thoroughly mixed. Subsequently, 2.998 grams of the resulting powder weredissolved in nitric acid (HNO3) and heated to transform all iron into FeĀ³. Uponadding ammonia (NH3), Fe2O3'xH2O precipitated, which was then heated to yield0.264 grams of Fe2O3 (with a formula mass of 159.69). What is the mean mass ofFeSO4.7H2O (with a formula mass of 278.01) in each tablet?