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=(3.Ar~O)/(MW~Cr_2O_3)* 100\%\\\\\%O=(3.16)/(152)* 100\%\\\\\%O=31.58\%`