What is the percent of aluminum in al2(so4)3

Answer : The percent of aluminium in is

Solution :

Molar mass of Aluminium = 26.98 g/mole

Molar mass of = 342.15 g/mole

First we have to calculate the mass of Aluminium.

Mass of 2 Al atoms = 2 × 26.98 g/mole = 53.96 g/mole

Now we have to calculate the percent composition of Aluminium in

Now put all the given values in this formula, we get

Therefore, the percent of aluminium in is

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

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