Question 1196140
.
A compound was analyzed and found to have the following percentage composition: 
aluminum, 15.77%; sulfur, 28.11%; and oxygen, 12.87%. 
Determine the empirical formula of salt.
~~~~~~~~~~~~~~



See the solution under this link


https://www.gusd.net/cms/lib/CA01000648/Centricity/Domain/1822/Act%20%208%204%20Molecular%20Form%20HydratKEY.pdf



////////////



Notice that the last number in your post is  INCORRECT.


This number  MUST  BE  the complement to  100%  of the sum  15.77%  and  28.11%.



                It  CAN  NOT  be any other number.