4. The aluminum in a 1.200-g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as Al2O3*H20. The precipitate was filtered and ignited at 1000 degrees C to give anhydrous Al2O3, which had a mass of 0.1798g.
a) What is the %Al in the original sample?
b) What is the %NH4Al(SO4)2 in the original sample?
The Book we are using is Analyticl Chemistry 7th edition By Skoog, West, Holler, and Crouch