Question

Determine which of the following contains the greatest mass of aluminium: 122 g of AlPO4, 266 g of A12C16, or 225 g of

Answer 1

Answer : The $Al_2S_3$ contains the greatest mass of aluminum.

Explanation :

For $AlPO_4$ :

Molar mass of $AlPO_4$ = 122 g/mole

Molar mass of aluminium = 27 g/mole

As, 122 g of $AlPO_4$ contains 27 g of Al

So, 122 g of $AlPO_4$ contains $\frac{122}{122}\times 27=27g$ of Al

The mass of 'Al' in $AlPO_4$ is, 27 grams.

For $Al_2Cl_6$ :

Molar mass of $Al_2Cl_6$ = 266.7 g/mole

Molar mass of aluminium = 27 g/mole

As, 266.7 g of $Al_2Cl_6$ contains $2\times 27g$ of Al

So, 266 g of $Al_2Cl_6$ contains $\frac{266}{266.7}\times 2\times 27=54g$ of Al

The mass of 'Al' in $Al_2Cl_6$ is, 54 grams.

For $Al_2S_3$ :

Molar mass of $Al_2S_3$ = 150 g/mole

Molar mass of aluminium = 27 g/mole

As, 150 g of $Al_2S_3$ contains $2\times 27g$ of Al

So, 225 g of $Al_2S_3$ contains $\frac{225}{150}\times 2\times 27=81g$ of Al

The mass of 'Al' in $Al_2S_3$ is, 81 grams.

Hence, from this we conclude that $Al_2S_3$ contains the greatest mass of aluminum.