What is the percent composition by weight of #Al# in #Al_2(SO_4)3#? Chemistry The Mole Concept Percent Composition 1 Answer anor277 May 2, 2016 #%"Composition"="Mass of component"/"Molar mass of compound"# #xx100%#, approx. 16% with respect to aluminum. Explanation: #(2xx26.98*g*mol^-1)/(342.15*g*mol^-1)xx100%# #=# #??%# Answer link Related questions What is mole percent? Question #e2e8b Question #bc737 Question #bc73b Question #e2e8f Question #b9857 Question #b985b Question #fee41 Question #c5c01 Question #bc73f See all questions in Percent Composition Impact of this question 1516 views around the world You can reuse this answer Creative Commons License