A 0 600 G Sample Containing Ag₂O and Inert Material Is

Multiple Choice

A 0. 600 g sample containing Ag₂O and inert material is heated, causing the silver oxide to decompose according to the following equation:
2Ag₂O(s) → 4Ag(s) + O₂(g)
If 13.8 mL of gas are collected over water at 27 °C and 1.001 bar external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mmHg at 27 °C.

A) 10.4%
B) 20.9%
C) 41.8%
D) 44.8%