Ans :
Percent yield is 80%
Percent yield = (actual yield / theoretical yield) x 100
80 = ( 25.678 g / m ) x 100
m = 32.0975 g
mol alum = mass / molar mass
= 32.0975 g / 474.39 g/mol
= 0.06766 mol
Each mol alum has one mol Al
So mol Al = 0.06766 mol
Mass Al = mol x molar mass
= 0.06766 mol x 26.98 g/mol
= 1.825 g Al
If a student needed to make 25.678 g alum and KOH and H2SO4 are in excess,...
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