Calculate the percent yield of alum if you obtained 75.0 g of potassium alum from 5.00 g Al.

Answer 1

Skeleton equation
Al ==> KAl(SO4)2.12H2O
mols Al = 5g/atomic mass Al
mols KAl(SO4)2.12H2O moles Al.
g KAl(SO4)2.12H2O = moles x molar mass. This is the theoretical yield.
%yield = (75/theoretical yield)*100= ?

Answer 2

(75/87.7848)*100=85.4362%

Answer 3

Just use the formula from "DaDood FrumCheers" Theorem which is N=Pv(Pv2)/T.