# Chapter 2 Atoms and Molecules - Problems - Page 74: 40

Cr$_{2}$O$_{3}$ = (2 x 59.9961) + (3 x 15.9994) = 151.9904 Mass %age of Cr in Cr$_{2}$O$_{3}$ = 68.4202 Percentage of Chromium = 68.4202 x 42.7/100 = 29.2154