The first inert as compound to be synthesized was #XePtF_6#, which is 440.37 g/mol. What is the percentage of platinum in the compound? Chemistry The Mole Concept Percent Composition 1 Answer anor277 May 10, 2016 #"% platinum"# #=# #"Mass of platinum"/("Molar mass of " XePtF_6)xx100%#, approx. 45-50%. Explanation: #"% platinum"# #=# #(195.08*g*mol^-1)/(440.37*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 5243 views around the world You can reuse this answer Creative Commons License