-Please Check my calculations-
Mass Data for preparation of Alum
Mass Weighing paper: 0.3832 grams
Mass Weighing paper plus Aluminum: 1.3838 grams
Mass of watch glass: 56.5001 grams
Mass of watch glass plus dry alum: 68.8550
Balanced Equation:2Al(s)+2KOH(aq)+4H2SO4(aq)+22H2O(l)=2KAl(SO4)2*12H2O(s)+3H2(g)
Yields of Alum
Mass of aluminum: 1.0006 grams
Mass of dry alum: 12.354 grams
Theoretical Yield:
1.0006/26.98 = .03709 moles Al (Mass Aluminum/Molar Mass)
.03709 * 474.3884g/mole Alum = 17.595 grams Alum (Moles Al/MolarMass of Alum)
Percent Yield
Actual/Theoritical x 100%
12.3549/17.595 = .7022 *100= 70.22%
