Question

If you have 1.20g of Al, how many grams of potassium aluminum sulfate dodecahydrate should you expect to produce if you have no other limiting reactants?

Answer 1

we know that

moles = mass /molar mass

molar mass of Al = 27 g/mol

given

mass of Al = 1.2 g

so

moles of Al = 1.2 / 27

moles of Al = 0.044444

now

we know that

potassium aluminum sulfate dodecahydrate is KAl(S04)2 . 12 H20

we can see that

1 mole of Al can given 1 mole of KAl(S04)2 . 12 H20

so

moles of KAl(SO4)2 . 12 H20 = moles of Al = 0.04444

now

mass = moles x molar mass

molar mass of KAl(SO4)2 = 474.3884 g/mol

so

mass of KAl(S04)2 produced = 0.0444 x 474.3884 = 21.084

so

21.084 grams of potassium aluminum sulfate dodecahydrate can be obtained