Question

Percentage composition of Al in KAl(SO4)2.12H2o​

Answer 1

First calculate the total molecular mass and take mass of aluminium be 27u

and then use formula

Mass of aluminium *100 / Total mass

Answer 2

Answer:

The percentage composition of Al in KAl(SO4)2.12H2O is 5.84%

Explanation:

Step 1 : Rewrite the chemical formula of the compound.

KAl(SO4) 2.12H2O

Step 2 : Calculate the molar mass of the compound by breaking down the molar mass of the component. T elements.

K = 39

Al = 27

S = 32

O = 16

H = 1

Calculating the molar mass of the compound :

39 + 27 + 32 × 2 + 16 × 4 × 2 + 12 × 16 + 12 × 1 = 462

Step 3 : Calculate the % composition of Al using the following formula.

% composition of Al = Mass of Al / molar mass of the compound × 100%

= 27/462 × 100% = 5.84%

The percentage composition of Al in the compound is 5.84%.