Question

Us What is the percent of O in Cr2O3? (Cr = 52.00 amu, O = 16.00 amu) [? ]%

Answer 1

The percent of O in  Cr₂O₃ : 31.58%

Further explanation

Given

Cr = 52.00 amu, O = 16.00 amu

Required

The percent of O

Solution

MW Cr₂O₃ = 2 x Ar Cr + 3 x Ar O

MW Cr₂O₃ = 2.52+3.16

MW Cr₂O₃ =152 amu

$\tt \%O=\dfrac{3.Ar~O}{MW~Cr_2O_3}\times 100\%\\\\\%O=\dfrac{3.16}{152}\times 100\%\\\\\%O=31.58\%$