Question

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

Answer 1

Answer : The percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

Solution :

Molar mass of Aluminium = 26.98 g/mole

Molar mass of $Al_2(SO_4)_3$ = 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 $Al_2(SO_4)_3$

$\%\text{ of Al}=\frac{\text{ Mass of Al}}{\text{ Total mass}}\times 100$

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

$\%\text{ of Al}=\frac{53.96g/mole}{342.15g/mole}\times 100$

$\%\text{ of Al}=15.77\%$

Therefore, the percent of aluminium in $Al_2(SO_4)_3$ is $15.77\%$

Answer 2

Answer should be: 15.77% or round to 15.80% / 15.8%