Chapter 18, Problem 18.109QP

Silver carbonate, Ag₂CO₃, is a light yellow compound that decomposes when heated to give silver oxide and carbon dioxide:

${\text{Ag}}_2{\text{CO}}_3(s)\stackrel{}{\rightleftharpoons }{\text{Ag}}_2\text{O}(s)+{\text{CO}}_2(g)$

A researcher measured the partial pressure of carbon dioxide over a sample of silver carbonate at 220°C and found that it was 1.37 atm. Calculate the partial pressure of carbon dioxide at 25°C. The standard enthalpies of formation of silver carbonate and silver oxide at 25°C are −505.9 kJ/mol and −31.05 kJ/mol, respectively. Make any reasonable assumptions in your calculations. State the assumptions that you make, and note why you think they are reasonable.