Calculate percentage of each element in Al2(So4)3 (Al=27, s=32, O=16) - Science - Atoms and Molecules

Question

Calculate percentage of each element in Al2(So4)3 (Al=27, s=32,
O=16)

Akanksha C. · Accepted Answer

Dear Student,

Relative atomic masses: Al = 27, S = 32 and
O = 16
Relative formula mass = 2x27 + 3x(32 + 4x16)
= 342
There are 4 x 3 = 12 oxygen atoms, each of
relative atomic mass 16,
Total mass of oxygen in the formula of 12 x
16 = 192
Percentage of oxygen in
Al2(SO4)3 = 100
x 192 / 342 = 56 1% oxygen by mass in aluminium
sulphate
Percentage of Sulphur in
Al2(SO4)3 = 100
x 96 / 342 = 28 07% oxygen by mass in aluminium
sulphate
Percentage of Aluminium in
Al2(SO4)3 = 100
x54 / 342 = 15 78 % oxygen by mass in aluminium
sulphate

Regards

Calculate percentage of each element in Al2(So4)3 (Al=27, s=32, O=16).